20976631157 has 2 divisors, whose sum is σ = 20976631158. Its totient is φ = 20976631156.

The previous prime is 20976631121. The next prime is 20976631229. The reversal of 20976631157 is 75113667902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18562972516 + 2413658641 = 136246^2 + 49129^2 .

It is a cyclic number.

It is not a de Polignac number, because 20976631157 - 2⁸ = 20976630901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20976691157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10488315578 + 10488315579.

It is an arithmetic number, because the mean of its divisors is an integer number (10488315579).

Almost surely, 2^20976631157 is an apocalyptic number.

It is an amenable number.

20976631157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20976631157 is an equidigital number, since it uses as much as digits as its factorization.

20976631157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 476280, while the sum is 47.

The spelling of 20976631157 in words is "twenty billion, nine hundred seventy-six million, six hundred thirty-one thousand, one hundred fifty-seven".