51890402020 has 24 divisors (see below), whose sum is σ = 109183951800. Its totient is φ = 20715378432.

The previous prime is 51890401973. The next prime is 51890402023. The reversal of 51890402020 is 2020409815.

It can be written as a sum of positive squares in 4 ways, for example, as 14164332196 + 37726069824 = 119014^2 + 194232^2 .

It is a super-2 number, since 2×51890402020² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51890402023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2538465 + ... + 2558824.

It is an arithmetic number, because the mean of its divisors is an integer number (4549331325).

Almost surely, 2^51890402020 is an apocalyptic number.

It is an amenable number.

51890402020 is an abundant number, since it is smaller than the sum of its proper divisors (57293549780).

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

51890402020 is a wasteful number, since it uses less digits than its factorization.

51890402020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5097807 (or 5097805 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 51890402020 in words is "fifty-one billion, eight hundred ninety million, four hundred two thousand, twenty".