20474698637 has 2 divisors, whose sum is σ = 20474698638. Its totient is φ = 20474698636.

The previous prime is 20474698609. The next prime is 20474698687. The reversal of 20474698637 is 73689647402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16667068201 + 3807630436 = 129101^2 + 61706^2 .

It is a cyclic number.

It is not a de Polignac number, because 20474698637 - 2⁸ = 20474698381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20474698687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10237349318 + 10237349319.

It is an arithmetic number, because the mean of its divisors is an integer number (10237349319).

Almost surely, 2^20474698637 is an apocalyptic number.

It is an amenable number.

20474698637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20474698637 is an equidigital number, since it uses as much as digits as its factorization.

20474698637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12192768, while the sum is 56.

The spelling of 20474698637 in words is "twenty billion, four hundred seventy-four million, six hundred ninety-eight thousand, six hundred thirty-seven".