20829742456 has 32 divisors (see below), whose sum is σ = 42687146880. Its totient is φ = 9486028800.

The previous prime is 20829742433. The next prime is 20829742469. The reversal of 20829742456 is 65424792802.

It is a congruent number.

It is an unprimeable number.

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, 2466105 + ... + 2474536.

It is an arithmetic number, because the mean of its divisors is an integer number (1333973340).

Almost surely, 2^20829742456 is an apocalyptic number.

It is an amenable number.

20829742456 is an abundant number, since it is smaller than the sum of its proper divisors (21857404424).

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

20829742456 is a wasteful number, since it uses less digits than its factorization.

20829742456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4940695 (or 4940691 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 20829742456 in words is "twenty billion, eight hundred twenty-nine million, seven hundred forty-two thousand, four hundred fifty-six".