20631776 has 24 divisors (see below), whose sum is σ = 44312184. Its totient is φ = 9377920.

The previous prime is 20631773. The next prime is 20631781. The reversal of 20631776 is 67713602.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20631773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28955 + ... + 29658.

It is an arithmetic number, because the mean of its divisors is an integer number (1846341).

Almost surely, 2^20631776 is an apocalyptic number.

It is an amenable number.

20631776 is an abundant number, since it is smaller than the sum of its proper divisors (23680408).

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

20631776 is a wasteful number, since it uses less digits than its factorization.

20631776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58634 (or 58626 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 20631776 is about 4542.2214829310. The cubic root of 20631776 is about 274.2703566963.

The spelling of 20631776 in words is "twenty million, six hundred thirty-one thousand, seven hundred seventy-six".