20135858 has 18 divisors (see below), whose sum is σ = 32069151. Its totient is φ = 9480924.

The previous prime is 20135827. The next prime is 20135867. The reversal of 20135858 is 85853102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10067929 + 10067929 = 3173^2 + 3173^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3173.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 120491 + ... + 120657.

Almost surely, 2^20135858 is an apocalyptic number.

20135858 is a deficient number, since it is larger than the sum of its proper divisors (11933293).

20135858 is an equidigital number, since it uses as much as digits as its factorization.

20135858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 20135858 is about 4487.2996334098. The cubic root of 20135858 is about 272.0550007721.

Multiplying 20135858 by its sum of digits (32), we get a square (644347456 = 25384²).

The spelling of 20135858 in words is "twenty million, one hundred thirty-five thousand, eight hundred fifty-eight".