20957049959 has 2 divisors, whose sum is σ = 20957049960. Its totient is φ = 20957049958.

The previous prime is 20957049937. The next prime is 20957049977. The reversal of 20957049959 is 95994075902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20957049959 - 2¹⁶ = 20956984423 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 20957049898 and 20957049907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20957049859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10478524979 + 10478524980.

It is an arithmetic number, because the mean of its divisors is an integer number (10478524980).

Almost surely, 2^20957049959 is an apocalyptic number.

20957049959 is a deficient number, since it is larger than the sum of its proper divisors (1).

20957049959 is an equidigital number, since it uses as much as digits as its factorization.

20957049959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9185400, while the sum is 59.

The spelling of 20957049959 in words is "twenty billion, nine hundred fifty-seven million, forty-nine thousand, nine hundred fifty-nine".