20625891 has 16 divisors (see below), whose sum is σ = 32309760. Its totient is φ = 11538720.

The previous prime is 20625877. The next prime is 20625893. The reversal of 20625891 is 19852602.

It is not a de Polignac number, because 20625891 - 2⁶ = 20625827 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20625893) 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, 23611 + ... + 24468.

It is an arithmetic number, because the mean of its divisors is an integer number (2019360).

Almost surely, 2^20625891 is an apocalyptic number.

20625891 is a deficient number, since it is larger than the sum of its proper divisors (11683869).

20625891 is a wasteful number, since it uses less digits than its factorization.

20625891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48106.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 20625891 is about 4541.5736259583. The cubic root of 20625891 is about 274.2442766255.

The spelling of 20625891 in words is "twenty million, six hundred twenty-five thousand, eight hundred ninety-one".