20438464 has 14 divisors (see below), whose sum is σ = 40557704. Its totient is φ = 10219200.

The previous prime is 20438447. The next prime is 20438497. The reversal of 20438464 is 46483402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159612 + ... + 159739.

Almost surely, 2^20438464 is an apocalyptic number.

It is an amenable number.

20438464 is a deficient number, since it is larger than the sum of its proper divisors (20119240).

20438464 is an equidigital number, since it uses as much as digits as its factorization.

20438464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319363 (or 319353 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 20438464 is about 4520.8919473927. The cubic root of 20438464 is about 273.4110638867.

It can be divided in two parts, 20438 and 464, that added together give a palindrome (20902).

The spelling of 20438464 in words is "twenty million, four hundred thirty-eight thousand, four hundred sixty-four".