402020000 has 60 divisors (see below), whose sum is σ = 989078706. Its totient is φ = 160800000.

The previous prime is 402019949. The next prime is 402020023. The reversal of 402020000 is 20204.

It can be written as a sum of positive squares in 5 ways, for example, as 258064 + 401761936 = 508^2 + 20044^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 402020000.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9950 + ... + 30050.

Almost surely, 2^402020000 is an apocalyptic number.

402020000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (494539353).

402020000 is an abundant number, since it is smaller than the sum of its proper divisors (587058706).

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

402020000 is an equidigital number, since it uses as much as digits as its factorization.

402020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20131 (or 20108 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 402020000 is about 20050.4364042282. The cubic root of 402020000 is about 738.0445083480.

Adding to 402020000 its reverse (20204), we get a palindrome (402040204).

The spelling of 402020000 in words is "four hundred two million, twenty thousand".