20731424 has 24 divisors (see below), whose sum is σ = 46646208. Its totient is φ = 8884800.

The previous prime is 20731423. The next prime is 20731429. The reversal of 20731424 is 42413702.

It is a self number, because there is not a number n which added to its sum of digits gives 20731424.

It is not an unprimeable number, because it can be changed into a prime (20731423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46052 + ... + 46499.

It is an arithmetic number, because the mean of its divisors is an integer number (1943592).

Almost surely, 2^20731424 is an apocalyptic number.

It is an amenable number.

20731424 is an abundant number, since it is smaller than the sum of its proper divisors (25914784).

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

20731424 is an equidigital number, since it uses as much as digits as its factorization.

20731424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92568 (or 92560 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 20731424 is about 4553.1773521355. The cubic root of 20731424 is about 274.7112075734.

The spelling of 20731424 in words is "twenty million, seven hundred thirty-one thousand, four hundred twenty-four".