20725865 has 16 divisors (see below), whose sum is σ = 27086400. Its totient is φ = 15164352.

The previous prime is 20725853. The next prime is 20725867. The reversal of 20725865 is 56852702.

It is a cyclic number.

It is not a de Polignac number, because 20725865 - 2⁶ = 20725801 is a prime.

It is a super-2 number, since 2×20725865² = 859122959996450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20725867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1007 + ... + 6516.

It is an arithmetic number, because the mean of its divisors is an integer number (1692900).

Almost surely, 2^20725865 is an apocalyptic number.

It is an amenable number.

20725865 is a deficient number, since it is larger than the sum of its proper divisors (6360535).

20725865 is a wasteful number, since it uses less digits than its factorization.

20725865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7576.

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 20725865 is about 4552.5668583778. The cubic root of 20725865 is about 274.6866513551.

The spelling of 20725865 in words is "twenty million, seven hundred twenty-five thousand, eight hundred sixty-five".