402505220 has 24 divisors (see below), whose sum is σ = 910281624. Its totient is φ = 148617216.

The previous prime is 402505193. The next prime is 402505231. The reversal of 402505220 is 22505204.

It can be written as a sum of positive squares in 4 ways, for example, as 1784896 + 400720324 = 1336^2 + 20018^2 .

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 = 402505192 and 402505201.

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, 773789 + ... + 774308.

It is an arithmetic number, because the mean of its divisors is an integer number (37928401).

Almost surely, 2^402505220 is an apocalyptic number.

It is an amenable number.

402505220 is an abundant number, since it is smaller than the sum of its proper divisors (507776404).

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

402505220 is a wasteful number, since it uses less digits than its factorization.

402505220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548119 (or 1548117 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 402505220 is about 20062.5327414063. The cubic root of 402505220 is about 738.3413177746.

The spelling of 402505220 in words is "four hundred two million, five hundred five thousand, two hundred twenty".