20354864 has 20 divisors (see below), whose sum is σ = 39510120. Its totient is φ = 10158720.

The previous prime is 20354861. The next prime is 20354881. The reversal of 20354864 is 46845302.

It is a self number, because there is not a number n which added to its sum of digits gives 20354864.

It is not an unprimeable number, because it can be changed into a prime (20354861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13004 + ... + 14484.

It is an arithmetic number, because the mean of its divisors is an integer number (1975506).

Almost surely, 2^20354864 is an apocalyptic number.

It is an amenable number.

20354864 is a deficient number, since it is larger than the sum of its proper divisors (19155256).

20354864 is a wasteful number, since it uses less digits than its factorization.

20354864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348 (or 2342 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 20354864 is about 4511.6365101812. The cubic root of 20354864 is about 273.0377742504.

The spelling of 20354864 in words is "twenty million, three hundred fifty-four thousand, eight hundred sixty-four".