20930578458 has 16 divisors (see below), whose sum is σ = 41862763200. Its totient is φ = 6976591776.

The previous prime is 20930578421. The next prime is 20930578489. The reversal of 20930578458 is 85487503902.

It is a super-2 number, since 2×20930578458² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20930578458.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163491 + ... + 261897.

It is an arithmetic number, because the mean of its divisors is an integer number (2616422700).

Almost surely, 2^20930578458 is an apocalyptic number.

20930578458 is an abundant number, since it is smaller than the sum of its proper divisors (20932184742).

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

20930578458 is a wasteful number, since it uses less digits than its factorization.

20930578458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133861.

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 20930578458 in words is "twenty billion, nine hundred thirty million, five hundred seventy-eight thousand, four hundred fifty-eight".