631232220 has 24 divisors (see below), whose sum is σ = 1767450384. Its totient is φ = 168328576.

The previous prime is 631232207. The next prime is 631232227. The reversal of 631232220 is 22232136.

It is a super-2 number, since 2×631232220² = 796908231132256800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631232227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5260209 + ... + 5260328.

It is an arithmetic number, because the mean of its divisors is an integer number (73643766).

Almost surely, 2^631232220 is an apocalyptic number.

631232220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

631232220 is an abundant number, since it is smaller than the sum of its proper divisors (1136218164).

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

631232220 is a wasteful number, since it uses less digits than its factorization.

631232220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10520549 (or 10520547 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 631232220 is about 25124.3352150858. The cubic root of 631232220 is about 857.8204317733.

Adding to 631232220 its reverse (22232136), we get a palindrome (653464356).

The spelling of 631232220 in words is "six hundred thirty-one million, two hundred thirty-two thousand, two hundred twenty".