20445893 has 16 divisors (see below), whose sum is σ = 22767360. Its totient is φ = 18242496.

The previous prime is 20445889. The next prime is 20445923. The reversal of 20445893 is 39854402.

It is a cyclic number.

It is not a de Polignac number, because 20445893 - 2² = 20445889 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445823) 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, 66446 + ... + 66752.

It is an arithmetic number, because the mean of its divisors is an integer number (1422960).

Almost surely, 2^20445893 is an apocalyptic number.

It is an amenable number.

20445893 is a deficient number, since it is larger than the sum of its proper divisors (2321467).

20445893 is a wasteful number, since it uses less digits than its factorization.

20445893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20445893 is about 4521.7135026448. The cubic root of 20445893 is about 273.4441864792. Note that the first 3 decimals are identical.

The spelling of 20445893 in words is "twenty million, four hundred forty-five thousand, eight hundred ninety-three".