20893145 has 32 divisors (see below), whose sum is σ = 31546368. Its totient is φ = 12930048.

The previous prime is 20893129. The next prime is 20893157. The reversal of 20893145 is 54139802.

It is a cyclic number.

It is not a de Polignac number, because 20893145 - 2⁴ = 20893129 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20897 + ... + 21873.

It is an arithmetic number, because the mean of its divisors is an integer number (985824).

Almost surely, 2^20893145 is an apocalyptic number.

It is an amenable number.

20893145 is a deficient number, since it is larger than the sum of its proper divisors (10653223).

20893145 is a wasteful number, since it uses less digits than its factorization.

20893145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20893145 is about 4570.9019897609. The cubic root of 20893145 is about 275.4236775065.

The spelling of 20893145 in words is "twenty million, eight hundred ninety-three thousand, one hundred forty-five".