51620020 has 24 divisors (see below), whose sum is σ = 109015200. Its totient is φ = 20531232.

The previous prime is 51620011. The next prime is 51620021. The reversal of 51620020 is 2002615.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51619976 and 51620003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51620021) 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, 3630 + ... + 10789.

It is an arithmetic number, because the mean of its divisors is an integer number (4542300).

Almost surely, 2^51620020 is an apocalyptic number.

It is an amenable number.

51620020 is an abundant number, since it is smaller than the sum of its proper divisors (57395180).

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

51620020 is a wasteful number, since it uses less digits than its factorization.

51620020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14607 (or 14605 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51620020 is about 7184.7073705197. The cubic root of 51620020 is about 372.3397385765.

Adding to 51620020 its reverse (2002615), we get a palindrome (53622635).

The spelling of 51620020 in words is "fifty-one million, six hundred twenty thousand, twenty".