20499472 has 40 divisors (see below), whose sum is σ = 45858176. Its totient is φ = 8695296.

The previous prime is 20499449. The next prime is 20499481. The reversal of 20499472 is 27499402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10648 + ... + 12424.

Almost surely, 2^20499472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20499472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22929088).

20499472 is an abundant number, since it is smaller than the sum of its proper divisors (25358704).

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

20499472 is a wasteful number, since it uses less digits than its factorization.

20499472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1895 (or 1889 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 20499472 is about 4527.6342608475. The cubic root of 20499472 is about 273.6828340323.

The spelling of 20499472 in words is "twenty million, four hundred ninety-nine thousand, four hundred seventy-two".