20712659 has 6 divisors (see below), whose sum is σ = 22766940. Its totient is φ = 18829580.

The previous prime is 20712649. The next prime is 20712689. The reversal of 20712659 is 95621702.

It is not a de Polignac number, because 20712659 - 2⁸ = 20712403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20712649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85469 + ... + 85710.

It is an arithmetic number, because the mean of its divisors is an integer number (3794490).

Almost surely, 2^20712659 is an apocalyptic number.

20712659 is a deficient number, since it is larger than the sum of its proper divisors (2054281).

20712659 is a wasteful number, since it uses less digits than its factorization.

20712659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171201 (or 171190 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 20712659 is about 4551.1162367050. The cubic root of 20712659 is about 274.6282978172.

The spelling of 20712659 in words is "twenty million, seven hundred twelve thousand, six hundred fifty-nine".