20156057 has 8 divisors (see below), whose sum is σ = 20395584. Its totient is φ = 19918288.

The previous prime is 20156029. The next prime is 20156063. The reversal of 20156057 is 75065102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20156057 - 2¹² = 20151961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20156077) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 45278 + ... + 45720.

It is an arithmetic number, because the mean of its divisors is an integer number (2549448).

Almost surely, 2^20156057 is an apocalyptic number.

It is an amenable number.

20156057 is a deficient number, since it is larger than the sum of its proper divisors (239527).

20156057 is a wasteful number, since it uses less digits than its factorization.

20156057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 20156057 is about 4489.5497547081. The cubic root of 20156057 is about 272.1459397410.

The spelling of 20156057 in words is "twenty million, one hundred fifty-six thousand, fifty-seven".