631000020 has 48 divisors (see below), whose sum is σ = 2019201408. Its totient is φ = 144228480.

The previous prime is 631000001. The next prime is 631000031. The reversal of 631000020 is 20000136.

631000020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×631000020² = 796322050480000800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 750771 + ... + 751610.

It is an arithmetic number, because the mean of its divisors is an integer number (42066696).

Almost surely, 2^631000020 is an apocalyptic number.

631000020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

631000020 is an abundant number, since it is smaller than the sum of its proper divisors (1388201388).

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

631000020 is a wasteful number, since it uses less digits than its factorization.

631000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502400 (or 1502398 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 631000020 is about 25119.7137722547. The cubic root of 631000020 is about 857.7152352351.

Adding to 631000020 its reverse (20000136), we get a palindrome (651000156).

The spelling of 631000020 in words is "six hundred thirty-one million, twenty", and thus it is an aban number.