20726631 has 16 divisors (see below), whose sum is σ = 31697920. Its totient is φ = 13371480.

The previous prime is 20726627. The next prime is 20726647. The reversal of 20726631 is 13662702.

It is a happy number.

20726631 is a `hidden beast` number, since 2 + 0 + 7 + 26 + 631 = 666.

It is not a de Polignac number, because 20726631 - 2² = 20726627 is a prime.

It is a super-2 number, since 2×20726631² = 859186465220322, which contains 22 as substring.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20726595 and 20726604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20726681) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11545 + ... + 13218.

It is an arithmetic number, because the mean of its divisors is an integer number (1981120).

Almost surely, 2^20726631 is an apocalyptic number.

20726631 is a deficient number, since it is larger than the sum of its proper divisors (10971289).

20726631 is a wasteful number, since it uses less digits than its factorization.

20726631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24803 (or 24797 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20726631 is about 4552.6509859641. The cubic root of 20726631 is about 274.6900353294.

It can be divided in two parts, 207266 and 31, that multiplied together give a palindrome (6425246).

The spelling of 20726631 in words is "twenty million, seven hundred twenty-six thousand, six hundred thirty-one".