20156100 has 36 divisors (see below), whose sum is σ = 58319184. Its totient is φ = 5374880.

The previous prime is 20156099. The next prime is 20156117. The reversal of 20156100 is 165102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20156100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33294 + ... + 33893.

Almost surely, 2^20156100 is an apocalyptic number.

20156100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20156100 is an abundant number, since it is smaller than the sum of its proper divisors (38163084).

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

20156100 is a wasteful number, since it uses less digits than its factorization.

20156100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67204 (or 67197 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20156100 is about 4489.5545436045. The cubic root of 20156100 is about 272.1461332687.

The spelling of 20156100 in words is "twenty million, one hundred fifty-six thousand, one hundred".