20812101637 has 2 divisors, whose sum is σ = 20812101638. Its totient is φ = 20812101636.

The previous prime is 20812101623. The next prime is 20812101707. The reversal of 20812101637 is 73610121802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14088265636 + 6723836001 = 118694^2 + 81999^2 .

It is a cyclic number.

It is not a de Polignac number, because 20812101637 - 2⁷ = 20812101509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20812101599 and 20812101608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20812101337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10406050818 + 10406050819.

It is an arithmetic number, because the mean of its divisors is an integer number (10406050819).

Almost surely, 2^20812101637 is an apocalyptic number.

It is an amenable number.

20812101637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20812101637 is an equidigital number, since it uses as much as digits as its factorization.

20812101637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The spelling of 20812101637 in words is "twenty billion, eight hundred twelve million, one hundred one thousand, six hundred thirty-seven".