20438176464 has 60 divisors (see below), whose sum is σ = 59685409056. Its totient is φ = 6516518976.

The previous prime is 20438176433. The next prime is 20438176523. The reversal of 20438176464 is 46467183402.

20438176464 is a `hidden beast` number, since 2 + 0 + 43 + 81 + 76 + 464 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3082162 + ... + 3088785.

Almost surely, 2^20438176464 is an apocalyptic number.

20438176464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20438176464 is an abundant number, since it is smaller than the sum of its proper divisors (39247232592).

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

20438176464 is a wasteful number, since it uses less digits than its factorization.

20438176464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6170984 (or 6170975 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 45.

The spelling of 20438176464 in words is "twenty billion, four hundred thirty-eight million, one hundred seventy-six thousand, four hundred sixty-four".