20923345 has 16 divisors (see below), whose sum is σ = 26967168. Its totient is φ = 15527680.

The previous prime is 20923337. The next prime is 20923349. The reversal of 20923345 is 54332902.

It is not a de Polignac number, because 20923345 - 2³ = 20923337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20923349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4302 + ... + 7768.

It is an arithmetic number, because the mean of its divisors is an integer number (1685448).

Almost surely, 2^20923345 is an apocalyptic number.

It is an amenable number.

20923345 is a deficient number, since it is larger than the sum of its proper divisors (6043823).

20923345 is a wasteful number, since it uses less digits than its factorization.

20923345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3560.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 20923345 is about 4574.2043023897. The cubic root of 20923345 is about 275.5563173527.

The spelling of 20923345 in words is "twenty million, nine hundred twenty-three thousand, three hundred forty-five".