20901725 has 24 divisors (see below), whose sum is σ = 28326312. Its totient is φ = 15206400.

The previous prime is 20901709. The next prime is 20901737. The reversal of 20901725 is 52710902.

It can be written as a sum of positive squares in 12 ways, for example, as 12264004 + 8637721 = 3502^2 + 2939^2 .

It is not a de Polignac number, because 20901725 - 2⁴ = 20901709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20901694 and 20901703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23285 + ... + 24165.

It is an arithmetic number, because the mean of its divisors is an integer number (1180263).

Almost surely, 2^20901725 is an apocalyptic number.

20901725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20901725 is a deficient number, since it is larger than the sum of its proper divisors (7424587).

20901725 is a wasteful number, since it uses less digits than its factorization.

20901725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977 (or 972 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 20901725 is about 4571.8404390355. The cubic root of 20901725 is about 275.4613742685.

The spelling of 20901725 in words is "twenty million, nine hundred one thousand, seven hundred twenty-five".