20955738929 has 2 divisors, whose sum is σ = 20955738930. Its totient is φ = 20955738928.

The previous prime is 20955738851. The next prime is 20955738971. The reversal of 20955738929 is 92983755902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20782105600 + 173633329 = 144160^2 + 13177^2 .

It is a cyclic number.

It is not a de Polignac number, because 20955738929 - 2²⁸ = 20687303473 is a prime.

It is not a weakly prime, because it can be changed into another prime (20955734929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10477869464 + 10477869465.

It is an arithmetic number, because the mean of its divisors is an integer number (10477869465).

Almost surely, 2^20955738929 is an apocalyptic number.

It is an amenable number.

20955738929 is a deficient number, since it is larger than the sum of its proper divisors (1).

20955738929 is an equidigital number, since it uses as much as digits as its factorization.

20955738929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12247200, while the sum is 59.

The spelling of 20955738929 in words is "twenty billion, nine hundred fifty-five million, seven hundred thirty-eight thousand, nine hundred twenty-nine".