20724459 has 16 divisors (see below), whose sum is σ = 33242880. Its totient is φ = 11219040.

The previous prime is 20724443. The next prime is 20724463. The reversal of 20724459 is 95442702.

It is not a de Polignac number, because 20724459 - 2⁴ = 20724443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20724259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25572 + ... + 26369.

It is an arithmetic number, because the mean of its divisors is an integer number (2077680).

Almost surely, 2^20724459 is an apocalyptic number.

20724459 is a deficient number, since it is larger than the sum of its proper divisors (12518421).

20724459 is a wasteful number, since it uses less digits than its factorization.

20724459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51970.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 20724459 is about 4552.4124373787. The cubic root of 20724459 is about 274.6804398224.

The spelling of 20724459 in words is "twenty million, seven hundred twenty-four thousand, four hundred fifty-nine".