20993315 has 16 divisors (see below), whose sum is σ = 29380800. Its totient is φ = 14394240.

The previous prime is 20993281. The next prime is 20993339. The reversal of 20993315 is 51339902.

It is not a de Polignac number, because 20993315 - 2⁸ = 20993059 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4406 + ... + 7835.

It is an arithmetic number, because the mean of its divisors is an integer number (1836300).

Almost surely, 2^20993315 is an apocalyptic number.

20993315 is a deficient number, since it is larger than the sum of its proper divisors (8387485).

20993315 is an equidigital number, since it uses as much as digits as its factorization.

20993315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12267 (or 12253 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 20993315 is about 4581.8462436009. The cubic root of 20993315 is about 275.8631392802.

The spelling of 20993315 in words is "twenty million, nine hundred ninety-three thousand, three hundred fifteen".