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18742620 = 22351324029
BaseRepresentation
bin100011101111…
…1110101011100
31022021020001010
41013133311130
514244230440
61505415220
7315211131
oct107376534
938236033
1018742620
11a641676
12633a510
133b63010
1426bc588
1519a3580
hex11dfd5c

18742620 has 48 divisors (see below), whose sum is σ = 56518560. Its totient is φ = 4613376.

The previous prime is 18742597. The next prime is 18742627. The reversal of 18742620 is 2624781.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18742627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11235 + ... + 12794.

It is an arithmetic number, because the mean of its divisors is an integer number (1177470).

Almost surely, 218742620 is an apocalyptic number.

18742620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18742620 is an abundant number, since it is smaller than the sum of its proper divisors (37775940).

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

18742620 is a wasteful number, since it uses less digits than its factorization.

18742620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24054 (or 24052 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 18742620 is about 4329.2747660549. The cubic root of 18742620 is about 265.6297825206.

The spelling of 18742620 in words is "eighteen million, seven hundred forty-two thousand, six hundred twenty".

Divisors: 1 2 3 4 5 6 10 12 13 15 20 26 30 39 52 60 65 78 130 156 195 260 390 780 24029 48058 72087 96116 120145 144174 240290 288348 312377 360435 480580 624754 720870 937131 1249508 1441740 1561885 1874262 3123770 3748524 4685655 6247540 9371310 18742620