438900020 has 24 divisors (see below), whose sum is σ = 992589864. Its totient is φ = 162055296.

The previous prime is 438900013. The next prime is 438900047. The reversal of 438900020 is 20009834.

It can be written as a sum of positive squares in 4 ways, for example, as 100560784 + 338339236 = 10028^2 + 18394^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

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, 843779 + ... + 844298.

It is an arithmetic number, because the mean of its divisors is an integer number (41357911).

Almost surely, 2^438900020 is an apocalyptic number.

It is an amenable number.

438900020 is an abundant number, since it is smaller than the sum of its proper divisors (553689844).

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

438900020 is a wasteful number, since it uses less digits than its factorization.

438900020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688099 (or 1688097 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 438900020 is about 20949.9408113722. The cubic root of 438900020 is about 759.9561493628.

Adding to 438900020 its reverse (20009834), we get a palindrome (458909854).

The spelling of 438900020 in words is "four hundred thirty-eight million, nine hundred thousand, twenty".