20620725 has 12 divisors (see below), whose sum is σ = 34093056. Its totient is φ = 10997680.

The previous prime is 20620709. The next prime is 20620751. The reversal of 20620725 is 52702602.

It is not a de Polignac number, because 20620725 - 2⁴ = 20620709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20620695 and 20620704.

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, 137397 + ... + 137546.

It is an arithmetic number, because the mean of its divisors is an integer number (2841088).

Almost surely, 2^20620725 is an apocalyptic number.

20620725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20620725 is a deficient number, since it is larger than the sum of its proper divisors (13472331).

20620725 is a wasteful number, since it uses less digits than its factorization.

20620725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274956 (or 274951 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20620725 is about 4541.0048447453. The cubic root of 20620725 is about 274.2213787988.

The spelling of 20620725 in words is "twenty million, six hundred twenty thousand, seven hundred twenty-five".