20969724 has 24 divisors (see below), whose sum is σ = 50068480. Its totient is φ = 6827184.

The previous prime is 20969723. The next prime is 20969783. The reversal of 20969724 is 42796902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20969723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19804 + ... + 20835.

Almost surely, 2^20969724 is an apocalyptic number.

It is an amenable number.

20969724 is an abundant number, since it is smaller than the sum of its proper divisors (29098756).

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

20969724 is a wasteful number, since it uses less digits than its factorization.

20969724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40689 (or 40687 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 20969724 is about 4579.2711210410. The cubic root of 20969724 is about 275.7597678567.

The spelling of 20969724 in words is "twenty million, nine hundred sixty-nine thousand, seven hundred twenty-four".