51402020 has 48 divisors (see below), whose sum is σ = 111283200. Its totient is φ = 19933824.

The previous prime is 51402019. The next prime is 51402037. The reversal of 51402020 is 2020415.

It is a junction number, because it is equal to n+sod(n) for n = 51401986 and 51402004.

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, 139877 + ... + 140243.

It is an arithmetic number, because the mean of its divisors is an integer number (2318400).

Almost surely, 2^51402020 is an apocalyptic number.

It is an amenable number.

51402020 is an abundant number, since it is smaller than the sum of its proper divisors (59881180).

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

51402020 is a wasteful number, since it uses less digits than its factorization.

51402020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 51402020 is about 7169.5202070989. The cubic root of 51402020 is about 371.8148479314.

Adding to 51402020 its reverse (2020415), we get a palindrome (53422435).

The spelling of 51402020 in words is "fifty-one million, four hundred two thousand, twenty".