20025891 has 12 divisors (see below), whose sum is σ = 29472768. Its totient is φ = 13098384.

The previous prime is 20025883. The next prime is 20025899. The reversal of 20025891 is 19852002.

It is an interprime number because it is at equal distance from previous prime (20025883) and next prime (20025899).

It is not a de Polignac number, because 20025891 - 2³ = 20025883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20025899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20515 + ... + 21468.

It is an arithmetic number, because the mean of its divisors is an integer number (2456064).

Almost surely, 2^20025891 is an apocalyptic number.

20025891 is a deficient number, since it is larger than the sum of its proper divisors (9446877).

20025891 is a wasteful number, since it uses less digits than its factorization.

20025891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42042 (or 42039 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 20025891 is about 4475.0297205717. The cubic root of 20025891 is about 271.5588427957.

Adding to 20025891 its reverse (19852002), we get a palindrome (39877893).

Subtracting from 20025891 its reverse (19852002), we obtain a square (173889 = 417²).

The spelling of 20025891 in words is "twenty million, twenty-five thousand, eight hundred ninety-one".