20727725 has 12 divisors (see below), whose sum is σ = 25960020. Its totient is φ = 16416000.

The previous prime is 20727701. The next prime is 20727757. The reversal of 20727725 is 52772702.

It can be written as a sum of positive squares in 6 ways, for example, as 243049 + 20484676 = 493^2 + 4526^2 .

It is not a de Polignac number, because 20727725 - 2⁶ = 20727661 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20727691 and 20727700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1580 + ... + 6629.

It is an arithmetic number, because the mean of its divisors is an integer number (2163335).

Almost surely, 2^20727725 is an apocalyptic number.

20727725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20727725 is a deficient number, since it is larger than the sum of its proper divisors (5232295).

20727725 is a wasteful number, since it uses less digits than its factorization.

20727725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8320 (or 8315 counting only the distinct ones).

The product of its (nonzero) digits is 13720, while the sum is 32.

The square root of 20727725 is about 4552.7711341555. The cubic root of 20727725 is about 274.6948681716.

The spelling of 20727725 in words is "twenty million, seven hundred twenty-seven thousand, seven hundred twenty-five".