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19663900 = 22521743269
BaseRepresentation
bin100101100000…
…0110000011100
31101000000210121
41023000300130
520013221100
61541244324
7326066104
oct113006034
941000717
1019663900
1110110863
1267036a4
1340c6459
14287c204
151ad651a
hex12c0c1c

19663900 has 72 divisors (see below), whose sum is σ = 46403280. Its totient is φ = 7203840.

The previous prime is 19663877. The next prime is 19663961. The reversal of 19663900 is 936691.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72966 + ... + 73234.

It is an arithmetic number, because the mean of its divisors is an integer number (644490).

Almost surely, 219663900 is an apocalyptic number.

19663900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19663900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23201640).

19663900 is an abundant number, since it is smaller than the sum of its proper divisors (26739380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19663900 is a wasteful number, since it uses less digits than its factorization.

19663900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 19663900 is about 4434.3996211438. The cubic root of 19663900 is about 269.9126374878.

19663900 divided by its sum of digits (34) gives a triangular number (578350 = T1075).

The spelling of 19663900 in words is "nineteen million, six hundred sixty-three thousand, nine hundred".

Divisors: 1 2 4 5 10 17 20 25 34 43 50 68 85 86 100 170 172 215 269 340 425 430 538 731 850 860 1075 1076 1345 1462 1700 2150 2690 2924 3655 4300 4573 5380 6725 7310 9146 11567 13450 14620 18275 18292 22865 23134 26900 36550 45730 46268 57835 73100 91460 114325 115670 196639 228650 231340 289175 393278 457300 578350 786556 983195 1156700 1966390 3932780 4915975 9831950 19663900