20724432 has 20 divisors (see below), whose sum is σ = 53538240. Its totient is φ = 6908128.

The previous prime is 20724427. The next prime is 20724437. The reversal of 20724432 is 23442702.

It is an interprime number because it is at equal distance from previous prime (20724427) and next prime (20724437).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20724437) 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, 215832 + ... + 215927.

It is an arithmetic number, because the mean of its divisors is an integer number (2676912).

Almost surely, 2^20724432 is an apocalyptic number.

It is an amenable number.

20724432 is an abundant number, since it is smaller than the sum of its proper divisors (32813808).

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

20724432 is a wasteful number, since it uses less digits than its factorization.

20724432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431770 (or 431764 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 24.

The square root of 20724432 is about 4552.4094719170. The cubic root of 20724432 is about 274.6803205370.

The spelling of 20724432 in words is "twenty million, seven hundred twenty-four thousand, four hundred thirty-two".