20297643975 has 72 divisors (see below), whose sum is σ = 41735995392. Its totient is φ = 9237153600.

The previous prime is 20297643973. The next prime is 20297643997. The reversal of 20297643975 is 57934679202.

It is not a de Polignac number, because 20297643975 - 2¹ = 20297643973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20297643973) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 322330 + ... + 380120.

Almost surely, 2^20297643975 is an apocalyptic number.

20297643975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20297643975 is an abundant number, since it is smaller than the sum of its proper divisors (21438351417).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20297643975 is a wasteful number, since it uses less digits than its factorization.

20297643975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58037 (or 58029 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 54.

The spelling of 20297643975 in words is "twenty billion, two hundred ninety-seven million, six hundred forty-three thousand, nine hundred seventy-five".