520631820 has 48 divisors (see below), whose sum is σ = 1619745120. Its totient is φ = 138835008.

The previous prime is 520631807. The next prime is 520631821. The reversal of 520631820 is 28136025.

520631820 is a `hidden beast` number, since 5 + 2 + 0 + 631 + 8 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (520631821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481527 + ... + 482606.

It is an arithmetic number, because the mean of its divisors is an integer number (33744690).

Almost surely, 2^520631820 is an apocalyptic number.

It is an amenable number.

520631820 is an abundant number, since it is smaller than the sum of its proper divisors (1099113300).

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

520631820 is a wasteful number, since it uses less digits than its factorization.

520631820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964151 (or 964143 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 520631820 is about 22817.3578663262. The cubic root of 520631820 is about 804.4707089945.

Adding to 520631820 its reverse (28136025), we get a palindrome (548767845).

The spelling of 520631820 in words is "five hundred twenty million, six hundred thirty-one thousand, eight hundred twenty".