20151628 has 24 divisors (see below), whose sum is σ = 42425600. Its totient is φ = 8181648.

The previous prime is 20151619. The next prime is 20151667. The reversal of 20151628 is 82615102.

It is a super-2 number, since 2×20151628² = 812176222100768, which contains 22 as substring.

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, 18408 + ... + 19471.

Almost surely, 2^20151628 is an apocalyptic number.

20151628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20151628 is an abundant number, since it is smaller than the sum of its proper divisors (22273972).

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

20151628 is a wasteful number, since it uses less digits than its factorization.

20151628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37909 (or 37907 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 20151628 is about 4489.0564710193. The cubic root of 20151628 is about 272.1260049118.

The spelling of 20151628 in words is "twenty million, one hundred fifty-one thousand, six hundred twenty-eight".