402444020 has 48 divisors (see below), whose sum is σ = 953769600. Its totient is φ = 141294720.

The previous prime is 402444019. The next prime is 402444071. The reversal of 402444020 is 20444204.

It is a super-2 number, since 2×402444020² = 323922378467520800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 402443983 and 402444001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25160 + ... + 37919.

It is an arithmetic number, because the mean of its divisors is an integer number (19870200).

Almost surely, 2^402444020 is an apocalyptic number.

It is an amenable number.

402444020 is an abundant number, since it is smaller than the sum of its proper divisors (551325580).

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

402444020 is a wasteful number, since it uses less digits than its factorization.

402444020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63128 (or 63126 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 402444020 is about 20061.0074522692. The cubic root of 402444020 is about 738.3038948404.

Adding to 402444020 its reverse (20444204), we get a palindrome (422888224).

The spelling of 402444020 in words is "four hundred two million, four hundred forty-four thousand, twenty".