20633720 has 16 divisors (see below), whose sum is σ = 46425960. Its totient is φ = 8253472.

The previous prime is 20633663. The next prime is 20633729. The reversal of 20633720 is 2733602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20633729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257882 + ... + 257961.

Almost surely, 2^20633720 is an apocalyptic number.

20633720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20633720 is an abundant number, since it is smaller than the sum of its proper divisors (25792240).

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

20633720 is a wasteful number, since it uses less digits than its factorization.

20633720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515854 (or 515850 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 20633720 is about 4542.4354700975. The cubic root of 20633720 is about 274.2789706717.

The spelling of 20633720 in words is "twenty million, six hundred thirty-three thousand, seven hundred twenty".