20993336 has 32 divisors (see below), whose sum is σ = 48447840. Its totient is φ = 8304768.

The previous prime is 20993281. The next prime is 20993339. The reversal of 20993336 is 63339902.

It is a junction number, because it is equal to n+sod(n) for n = 20993296 and 20993305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20993339) 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, 13691 + ... + 15146.

It is an arithmetic number, because the mean of its divisors is an integer number (1513995).

Almost surely, 2^20993336 is an apocalyptic number.

20993336 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20993336 is an abundant number, since it is smaller than the sum of its proper divisors (27454504).

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

20993336 is a wasteful number, since it uses less digits than its factorization.

20993336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28863 (or 28859 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 35.

The square root of 20993336 is about 4581.8485352530. The cubic root of 20993336 is about 275.8632312638.

The spelling of 20993336 in words is "twenty million, nine hundred ninety-three thousand, three hundred thirty-six".