20742424 has 24 divisors (see below), whose sum is σ = 40292460. Its totient is φ = 10010336.

The previous prime is 20742413. The next prime is 20742443. The reversal of 20742424 is 42424702.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5187 + ... + 8269.

Almost surely, 2^20742424 is an apocalyptic number.

It is an amenable number.

20742424 is a deficient number, since it is larger than the sum of its proper divisors (19550036).

20742424 is a wasteful number, since it uses less digits than its factorization.

20742424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3147 (or 3114 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 25.

The square root of 20742424 is about 4554.3851396209. The cubic root of 20742424 is about 274.7597858248.

The spelling of 20742424 in words is "twenty million, seven hundred forty-two thousand, four hundred twenty-four".