20307575997 has 6 divisors (see below), whose sum is σ = 29333165342. Its totient is φ = 13538383992.

The previous prime is 20307575963. The next prime is 20307576011. The reversal of 20307575997 is 79957570302.

It can be written as a sum of positive squares in only one way, i.e., 11216716281 + 9090859716 = 105909^2 + 95346^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20307575997 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 (20307575297) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1128198658 + ... + 1128198675.

Almost surely, 2^20307575997 is an apocalyptic number.

It is an amenable number.

20307575997 is a deficient number, since it is larger than the sum of its proper divisors (9025589345).

20307575997 is a wasteful number, since it uses less digits than its factorization.

20307575997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256397339 (or 2256397336 counting only the distinct ones).

The product of its (nonzero) digits is 4167450, while the sum is 54.

The spelling of 20307575997 in words is "twenty billion, three hundred seven million, five hundred seventy-five thousand, nine hundred ninety-seven".