20976631069 has 2 divisors, whose sum is σ = 20976631070. Its totient is φ = 20976631068.

The previous prime is 20976631037. The next prime is 20976631073. The reversal of 20976631069 is 96013667902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20935196100 + 41434969 = 144690^2 + 6437^2 .

It is a cyclic number.

It is not a de Polignac number, because 20976631069 - 2⁵ = 20976631037 is a prime.

It is a super-2 number, since 2×20976631069² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20976631019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10488315534 + 10488315535.

It is an arithmetic number, because the mean of its divisors is an integer number (10488315535).

Almost surely, 2^20976631069 is an apocalyptic number.

It is an amenable number.

20976631069 is a deficient number, since it is larger than the sum of its proper divisors (1).

20976631069 is an equidigital number, since it uses as much as digits as its factorization.

20976631069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 49.

The spelling of 20976631069 in words is "twenty billion, nine hundred seventy-six million, six hundred thirty-one thousand, sixty-nine".