20156236 has 6 divisors (see below), whose sum is σ = 35273420. Its totient is φ = 10078116.

The previous prime is 20156219. The next prime is 20156243. The reversal of 20156236 is 63265102.

It is a self number, because there is not a number n which added to its sum of digits gives 20156236.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2519526 + ... + 2519533.

Almost surely, 2^20156236 is an apocalyptic number.

It is an amenable number.

20156236 is a deficient number, since it is larger than the sum of its proper divisors (15117184).

20156236 is a wasteful number, since it uses less digits than its factorization.

20156236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5039063 (or 5039061 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20156236 is about 4489.5696898478. The cubic root of 20156236 is about 272.1467453546.

The spelling of 20156236 in words is "twenty million, one hundred fifty-six thousand, two hundred thirty-six".