20156979194 has 16 divisors (see below), whose sum is σ = 33751222560. Its totient is φ = 8949186960.

The previous prime is 20156979149. The next prime is 20156979259. The reversal of 20156979194 is 49197965102.

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, 10652849 + ... + 10654740.

It is an arithmetic number, because the mean of its divisors is an integer number (2109451410).

Almost surely, 2^20156979194 is an apocalyptic number.

20156979194 is a deficient number, since it is larger than the sum of its proper divisors (13594243366).

20156979194 is a wasteful number, since it uses less digits than its factorization.

20156979194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21307645.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The spelling of 20156979194 in words is "twenty billion, one hundred fifty-six million, nine hundred seventy-nine thousand, one hundred ninety-four".