20042658 has 12 divisors (see below), whose sum is σ = 43425798. Its totient is φ = 6680880.

The previous prime is 20042653. The next prime is 20042669. The reversal of 20042658 is 85624002.

20042658 is a `hidden beast` number, since 2 + 0 + 0 + 4 + 2 + 658 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15233409 + 4809249 = 3903^2 + 2193^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20042653) 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, 556723 + ... + 556758.

Almost surely, 2^20042658 is an apocalyptic number.

20042658 is an abundant number, since it is smaller than the sum of its proper divisors (23383140).

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

20042658 is a wasteful number, since it uses less digits than its factorization.

20042658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113489 (or 1113486 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20042658 is about 4476.9027239823. The cubic root of 20042658 is about 271.6346106597.

The spelling of 20042658 in words is "twenty million, forty-two thousand, six hundred fifty-eight".