402020420 has 24 divisors (see below), whose sum is σ = 893904984. Its totient is φ = 151348736.

The previous prime is 402020419. The next prime is 402020441. The reversal of 402020420 is 24020204.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 66324736 + 335695684 = 8144^2 + 18322^2 .

It is a junction number, because it is equal to n+sod(n) for n = 402020395 and 402020404.

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, 590867 + ... + 591546.

It is an arithmetic number, because the mean of its divisors is an integer number (37246041).

Almost surely, 2^402020420 is an apocalyptic number.

It is an amenable number.

402020420 is an abundant number, since it is smaller than the sum of its proper divisors (491884564).

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

402020420 is a wasteful number, since it uses less digits than its factorization.

402020420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182439 (or 1182437 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 402020420 is about 20050.4468778130. The cubic root of 402020420 is about 738.0447653655.

Adding to 402020420 its reverse (24020204), we get a palindrome (426040624).

The spelling of 402020420 in words is "four hundred two million, twenty thousand, four hundred twenty".