20147631 has 32 divisors (see below), whose sum is σ = 31795200. Its totient is φ = 11110656.

The previous prime is 20147623. The next prime is 20147671. The reversal of 20147631 is 13674102.

It is not a de Polignac number, because 20147631 - 2³ = 20147623 is a prime.

It is a super-2 number, since 2×20147631² = 811854069824322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20147671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135145 + ... + 135293.

It is an arithmetic number, because the mean of its divisors is an integer number (993600).

Almost surely, 2^20147631 is an apocalyptic number.

20147631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20147631 is a deficient number, since it is larger than the sum of its proper divisors (11647569).

20147631 is a wasteful number, since it uses less digits than its factorization.

20147631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20147631 is about 4488.6112551657. The cubic root of 20147631 is about 272.1080119972.

The spelling of 20147631 in words is "twenty million, one hundred forty-seven thousand, six hundred thirty-one".