5120640020 has 18 divisors (see below), whose sum is σ = 10754016126. Its totient is φ = 2048128000.

The previous prime is 5120640013. The next prime is 5120640037. The reversal of 5120640020 is 200460215.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2171932816 + 2948707204 = 46604^2 + 54302^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 5120639974 and 5120640001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 312020 + ... + 328020.

Almost surely, 2^5120640020 is an apocalyptic number.

It is an amenable number.

5120640020 is an abundant number, since it is smaller than the sum of its proper divisors (5633376106).

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

5120640020 is an frugal number, since it uses more digits than its factorization.

5120640020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32011 (or 16008 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 5120640020 is about 71558.6474159483. The cubic root of 5120640020 is about 1723.6195657671.

Multiplying 5120640020 by its sum of digits (20), we get a square (102412800400 = 320020²).

5120640020 divided by its sum of digits (20) gives a square (256032001 = 16001²).

The spelling of 5120640020 in words is "five billion, one hundred twenty million, six hundred forty thousand, twenty".