20724465 has 16 divisors (see below), whose sum is σ = 33580800. Its totient is φ = 10912512.

The previous prime is 20724463. The next prime is 20724467. The reversal of 20724465 is 56442702.

It is an interprime number because it is at equal distance from previous prime (20724463) and next prime (20724467).

It is not a de Polignac number, because 20724465 - 2¹ = 20724463 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20724463) 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, 7560 + ... + 9929.

It is an arithmetic number, because the mean of its divisors is an integer number (2098800).

Almost surely, 2^20724465 is an apocalyptic number.

It is an amenable number.

20724465 is a deficient number, since it is larger than the sum of its proper divisors (12856335).

20724465 is a wasteful number, since it uses less digits than its factorization.

20724465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17576.

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 20724465 is about 4552.4130963699. The cubic root of 20724465 is about 274.6804663302.

The spelling of 20724465 in words is "twenty million, seven hundred twenty-four thousand, four hundred sixty-five".