20631424 has 32 divisors (see below), whose sum is σ = 44841240. Its totient is φ = 9377280.

The previous prime is 20631409. The next prime is 20631433. The reversal of 20631424 is 42413602.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 20631395 and 20631404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5919 + ... + 8734.

Almost surely, 2^20631424 is an apocalyptic number.

It is an amenable number.

20631424 is an abundant number, since it is smaller than the sum of its proper divisors (24209816).

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

20631424 is a wasteful number, since it uses less digits than its factorization.

20631424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14678 (or 14666 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20631424 is about 4542.1827352056. The cubic root of 20631424 is about 274.2687969063.

The spelling of 20631424 in words is "twenty million, six hundred thirty-one thousand, four hundred twenty-four".