20925844 has 12 divisors (see below), whose sum is σ = 38774484. Its totient is φ = 9847424.

The previous prime is 20925841. The next prime is 20925847. The reversal of 20925844 is 44852902.

It is an interprime number because it is at equal distance from previous prime (20925841) and next prime (20925847).

It can be written as a sum of positive squares in 2 ways, for example, as 9229444 + 11696400 = 3038^2 + 3420^2 .

It is a super-2 number, since 2×20925844² = 875781894224672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20925841) 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, 153799 + ... + 153934.

It is an arithmetic number, because the mean of its divisors is an integer number (3231207).

Almost surely, 2^20925844 is an apocalyptic number.

It is an amenable number.

20925844 is a deficient number, since it is larger than the sum of its proper divisors (17848640).

20925844 is a wasteful number, since it uses less digits than its factorization.

20925844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307754 (or 307752 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 20925844 is about 4574.4774564971. The cubic root of 20925844 is about 275.5672873613.

The spelling of 20925844 in words is "twenty million, nine hundred twenty-five thousand, eight hundred forty-four".