20015156 has 12 divisors (see below), whose sum is σ = 40030368. Its totient is φ = 8577912.

The previous prime is 20015147. The next prime is 20015173. The reversal of 20015156 is 65151002.

20015156 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357386 + ... + 357441.

It is an arithmetic number, because the mean of its divisors is an integer number (3335864).

Almost surely, 2^20015156 is an apocalyptic number.

It is an amenable number.

20015156 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20015156 is a wasteful number, since it uses less digits than its factorization.

20015156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714838 (or 714836 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 20015156 is about 4473.8301264129. The cubic root of 20015156 is about 271.5103105360.

Adding to 20015156 its reverse (65151002), we get a palindrome (85166158).

The spelling of 20015156 in words is "twenty million, fifteen thousand, one hundred fifty-six".