20023631977 has 2 divisors, whose sum is σ = 20023631978. Its totient is φ = 20023631976.

The previous prime is 20023631963. The next prime is 20023632007. The reversal of 20023631977 is 77913632002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19224099801 + 799532176 = 138651^2 + 28276^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20023631977 is a prime.

It is not a weakly prime, because it can be changed into another prime (20027631977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011815988 + 10011815989.

It is an arithmetic number, because the mean of its divisors is an integer number (10011815989).

Almost surely, 2^20023631977 is an apocalyptic number.

It is an amenable number.

20023631977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023631977 is an equidigital number, since it uses as much as digits as its factorization.

20023631977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 40.

The spelling of 20023631977 in words is "twenty billion, twenty-three million, six hundred thirty-one thousand, nine hundred seventy-seven".