20443845 has 16 divisors (see below), whose sum is σ = 33247872. Its totient is φ = 10724160.

The previous prime is 20443837. The next prime is 20443853. The reversal of 20443845 is 54834402.

It is an interprime number because it is at equal distance from previous prime (20443837) and next prime (20443853).

It is not a de Polignac number, because 20443845 - 2³ = 20443837 is a prime.

It is a congruent number.

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, 10257 + ... + 12086.

It is an arithmetic number, because the mean of its divisors is an integer number (2077992).

Almost surely, 2^20443845 is an apocalyptic number.

It is an amenable number.

20443845 is a deficient number, since it is larger than the sum of its proper divisors (12804027).

20443845 is a wasteful number, since it uses less digits than its factorization.

20443845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22412.

The product of its (nonzero) digits is 15360, while the sum is 30.

The square root of 20443845 is about 4521.4870341515. The cubic root of 20443845 is about 273.4350561632.

The spelling of 20443845 in words is "twenty million, four hundred forty-three thousand, eight hundred forty-five".