20844725 has 24 divisors (see below), whose sum is σ = 28405920. Its totient is φ = 15048000.

The previous prime is 20844721. The next prime is 20844731. The reversal of 20844725 is 52744802.

It is not a de Polignac number, because 20844725 - 2² = 20844721 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20844691 and 20844700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20844721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62810 + ... + 63140.

It is an arithmetic number, because the mean of its divisors is an integer number (1183580).

Almost surely, 2^20844725 is an apocalyptic number.

20844725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20844725 is a deficient number, since it is larger than the sum of its proper divisors (7561195).

20844725 is a wasteful number, since it uses less digits than its factorization.

20844725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581 (or 576 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 20844725 is about 4565.6023698960. The cubic root of 20844725 is about 275.2107475423.

The spelling of 20844725 in words is "twenty million, eight hundred forty-four thousand, seven hundred twenty-five".