20932591637 has 2 divisors, whose sum is σ = 20932591638. Its totient is φ = 20932591636.

The previous prime is 20932591633. The next prime is 20932591643. The reversal of 20932591637 is 73619523902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18351037156 + 2581554481 = 135466^2 + 50809^2 .

It is a cyclic number.

It is not a de Polignac number, because 20932591637 - 2² = 20932591633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20932591591 and 20932591600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20932591633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10466295818 + 10466295819.

It is an arithmetic number, because the mean of its divisors is an integer number (10466295819).

Almost surely, 2^20932591637 is an apocalyptic number.

It is an amenable number.

20932591637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20932591637 is an equidigital number, since it uses as much as digits as its factorization.

20932591637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 47.

The spelling of 20932591637 in words is "twenty billion, nine hundred thirty-two million, five hundred ninety-one thousand, six hundred thirty-seven".