20725659 has 8 divisors (see below), whose sum is σ = 30704720. Its totient is φ = 13817088.

The previous prime is 20725631. The next prime is 20725667. The reversal of 20725659 is 95652702.

20725659 is a `hidden beast` number, since 20 + 72 + 565 + 9 = 666.

It is not a de Polignac number, because 20725659 - 2⁸ = 20725403 is a prime.

It is a super-3 number, since 3×20725659³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20725619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383782 + ... + 383835.

It is an arithmetic number, because the mean of its divisors is an integer number (3838090).

Almost surely, 2^20725659 is an apocalyptic number.

20725659 is a deficient number, since it is larger than the sum of its proper divisors (9979061).

20725659 is an equidigital number, since it uses as much as digits as its factorization.

20725659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767626 (or 767620 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 20725659 is about 4552.5442337225. The cubic root of 20725659 is about 274.6857412903.

The spelling of 20725659 in words is "twenty million, seven hundred twenty-five thousand, six hundred fifty-nine".