20961325 has 24 divisors (see below), whose sum is σ = 32408640. Its totient is φ = 13065600.

The previous prime is 20961319. The next prime is 20961329. The reversal of 20961325 is 52316902.

It is not a de Polignac number, because 20961325 - 2¹³ = 20953133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20961293 and 20961302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20961329) 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, 3520 + ... + 7369.

It is an arithmetic number, because the mean of its divisors is an integer number (1350360).

Almost surely, 2^20961325 is an apocalyptic number.

20961325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20961325 is a deficient number, since it is larger than the sum of its proper divisors (11447315).

20961325 is a wasteful number, since it uses less digits than its factorization.

20961325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10917 (or 10912 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 20961325 is about 4578.3539618514. The cubic root of 20961325 is about 275.7229462692.

The spelling of 20961325 in words is "twenty million, nine hundred sixty-one thousand, three hundred twenty-five".