20976631229 has 2 divisors, whose sum is σ = 20976631230. Its totient is φ = 20976631228.

The previous prime is 20976631157. The next prime is 20976631243. The reversal of 20976631229 is 92213667902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20842696900 + 133934329 = 144370^2 + 11573^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20976631229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20976631829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10488315614 + 10488315615.

It is an arithmetic number, because the mean of its divisors is an integer number (10488315615).

Almost surely, 2^20976631229 is an apocalyptic number.

It is an amenable number.

20976631229 is a deficient number, since it is larger than the sum of its proper divisors (1).

20976631229 is an equidigital number, since it uses as much as digits as its factorization.

20976631229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 20976631229 in words is "twenty billion, nine hundred seventy-six million, six hundred thirty-one thousand, two hundred twenty-nine".