20149979794 has 32 divisors (see below), whose sum is σ = 36724803840. Its totient is φ = 8104379712.

The previous prime is 20149979791. The next prime is 20149979809. The reversal of 20149979794 is 49797994102.

It is not an unprimeable number, because it can be changed into a prime (20149979791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 573289 + ... + 607420.

It is an arithmetic number, because the mean of its divisors is an integer number (1147650120).

Almost surely, 2^20149979794 is an apocalyptic number.

20149979794 is a deficient number, since it is larger than the sum of its proper divisors (16574824046).

20149979794 is a wasteful number, since it uses less digits than its factorization.

20149979794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180794.

The product of its (nonzero) digits is 10287648, while the sum is 61.

The spelling of 20149979794 in words is "twenty billion, one hundred forty-nine million, nine hundred seventy-nine thousand, seven hundred ninety-four".