20578532997 has 32 divisors (see below), whose sum is σ = 31730780160. Its totient is φ = 11724261120.

The previous prime is 20578532921. The next prime is 20578533013. The reversal of 20578532997 is 79923587502.

It is a happy number.

It is not a de Polignac number, because 20578532997 - 2⁷ = 20578532869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20578532497) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 460548 + ... + 503250.

It is an arithmetic number, because the mean of its divisors is an integer number (991586880).

Almost surely, 2^20578532997 is an apocalyptic number.

It is an amenable number.

20578532997 is a deficient number, since it is larger than the sum of its proper divisors (11152247163).

20578532997 is a wasteful number, since it uses less digits than its factorization.

20578532997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43593.

The product of its (nonzero) digits is 9525600, while the sum is 57.

The spelling of 20578532997 in words is "twenty billion, five hundred seventy-eight million, five hundred thirty-two thousand, nine hundred ninety-seven".