51020020 has 24 divisors (see below), whose sum is σ = 108186624. Its totient is φ = 20209056.

The previous prime is 51019999. The next prime is 51020029. The reversal of 51020020 is 2002015.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 51019979 and 51020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51020029) 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, 10324 + ... + 14443.

It is an arithmetic number, because the mean of its divisors is an integer number (4507776).

Almost surely, 2^51020020 is an apocalyptic number.

It is an amenable number.

51020020 is an abundant number, since it is smaller than the sum of its proper divisors (57166604).

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

51020020 is a wasteful number, since it uses less digits than its factorization.

51020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24879 (or 24877 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 51020020 is about 7142.8299713769. The cubic root of 51020020 is about 370.8914952609.

Adding to 51020020 its reverse (2002015), we get a palindrome (53022035).

The spelling of 51020020 in words is "fifty-one million, twenty thousand, twenty".