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20778268 = 2272925589
BaseRepresentation
bin100111101000…
…0110100011100
31110002122102111
41033100310130
520304401033
62021203404
7341420020
oct117206434
943078374
1020778268
1110802025
126b60564
1343c6744
142a8c380
151c567cd
hex13d0d1c

20778268 has 24 divisors (see below), whose sum is σ = 42991200. Its totient is φ = 8597568.

The previous prime is 20778253. The next prime is 20778283. The reversal of 20778268 is 86287702.

It is an interprime number because it is at equal distance from previous prime (20778253) and next prime (20778283).

It is a self number, because there is not a number n which added to its sum of digits gives 20778268.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11983 + ... + 13606.

It is an arithmetic number, because the mean of its divisors is an integer number (1791300).

Almost surely, 220778268 is an apocalyptic number.

20778268 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20778268 is an abundant number, since it is smaller than the sum of its proper divisors (22212932).

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

20778268 is a wasteful number, since it uses less digits than its factorization.

20778268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25629 (or 25627 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 20778268 is about 4558.3185496409. The cubic root of 20778268 is about 274.9179612033.

The spelling of 20778268 in words is "twenty million, seven hundred seventy-eight thousand, two hundred sixty-eight".

Divisors: 1 2 4 7 14 28 29 58 116 203 406 812 25589 51178 102356 179123 358246 716492 742081 1484162 2968324 5194567 10389134 20778268