20697931842 has 32 divisors (see below), whose sum is σ = 47318390784. Its totient is φ = 5912590800.

The previous prime is 20697931829. The next prime is 20697931867. The reversal of 20697931842 is 24813979602.

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 in 15 ways as a sum of consecutive naturals, for example, 196717 + ... + 283007.

It is an arithmetic number, because the mean of its divisors is an integer number (1478699712).

Almost surely, 2^20697931842 is an apocalyptic number.

20697931842 is an abundant number, since it is smaller than the sum of its proper divisors (26620458942).

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

20697931842 is a wasteful number, since it uses less digits than its factorization.

20697931842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92014.

The product of its (nonzero) digits is 1306368, while the sum is 51.

The spelling of 20697931842 in words is "twenty billion, six hundred ninety-seven million, nine hundred thirty-one thousand, eight hundred forty-two".