20957049951 has 16 divisors (see below), whose sum is σ = 29445139200. Its totient is φ = 13221750528.

The previous prime is 20957049937. The next prime is 20957049959. The reversal of 20957049951 is 15994075902.

It is not a de Polignac number, because 20957049951 - 2⁶ = 20957049887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20957049894 and 20957049903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20957049959) 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 15 ways as a sum of consecutive naturals, for example, 144931 + ... + 250836.

It is an arithmetic number, because the mean of its divisors is an integer number (1840321200).

Almost surely, 2^20957049951 is an apocalyptic number.

20957049951 is a deficient number, since it is larger than the sum of its proper divisors (8488089249).

20957049951 is a wasteful number, since it uses less digits than its factorization.

20957049951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396718.

The product of its (nonzero) digits is 1020600, while the sum is 51.

The spelling of 20957049951 in words is "twenty billion, nine hundred fifty-seven million, forty-nine thousand, nine hundred fifty-one".