20779931442 has 16 divisors (see below), whose sum is σ = 41631897312. Its totient is φ = 6914638080.

The previous prime is 20779931441. The next prime is 20779931443. The reversal of 20779931442 is 24413997702.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20779931441) and next prime (20779931443).

It is a junction number, because it is equal to n+sod(n) for n = 20779931391 and 20779931400.

It is not an unprimeable number, because it can be changed into a prime (20779931441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2997684 + ... + 3004607.

It is an arithmetic number, because the mean of its divisors is an integer number (2601993582).

Almost surely, 2^20779931442 is an apocalyptic number.

20779931442 is an abundant number, since it is smaller than the sum of its proper divisors (20851965870).

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

20779931442 is a wasteful number, since it uses less digits than its factorization.

20779931442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6002873.

The product of its (nonzero) digits is 762048, while the sum is 48.

The spelling of 20779931442 in words is "twenty billion, seven hundred seventy-nine million, nine hundred thirty-one thousand, four hundred forty-two".