20768658 has 16 divisors (see below), whose sum is σ = 41646720. Its totient is φ = 6904656.

The previous prime is 20768617. The next prime is 20768711. The reversal of 20768658 is 85686702.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1978 + ... + 6741.

It is an arithmetic number, because the mean of its divisors is an integer number (2602920).

Almost surely, 2^20768658 is an apocalyptic number.

20768658 is an abundant number, since it is smaller than the sum of its proper divisors (20878062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20768658 is a wasteful number, since it uses less digits than its factorization.

20768658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9121.

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 20768658 is about 4557.2643109655. The cubic root of 20768658 is about 274.8755712567.

The spelling of 20768658 in words is "twenty million, seven hundred sixty-eight thousand, six hundred fifty-eight".