20638062997 has 4 divisors (see below), whose sum is σ = 20946093856. Its totient is φ = 20330032140.

The previous prime is 20638062989. The next prime is 20638063049. The reversal of 20638062997 is 79926083602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20638062997 - 2³ = 20638062989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20638062967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154015329 + ... + 154015462.

It is an arithmetic number, because the mean of its divisors is an integer number (5236523464).

Almost surely, 2^20638062997 is an apocalyptic number.

It is an amenable number.

20638062997 is a deficient number, since it is larger than the sum of its proper divisors (308030859).

20638062997 is an equidigital number, since it uses as much as digits as its factorization.

20638062997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308030858.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 20638062997 in words is "twenty billion, six hundred thirty-eight million, sixty-two thousand, nine hundred ninety-seven".