20238858 has 36 divisors (see below), whose sum is σ = 44891730. Its totient is φ = 6589776.

The previous prime is 20238851. The next prime is 20238887. The reversal of 20238858 is 85883202.

It can be written as a sum of positive squares in only one way, i.e., 14493249 + 5745609 = 3807^2 + 2397^2 .

It is a super-2 number, since 2×20238858² = 819222746288328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20238851) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 39508 + ... + 40016.

Almost surely, 2^20238858 is an apocalyptic number.

20238858 is an abundant number, since it is smaller than the sum of its proper divisors (24652872).

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

20238858 is a wasteful number, since it uses less digits than its factorization.

20238858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 20238858 is about 4498.7618296594. The cubic root of 20238858 is about 272.5180887468.

It can be divided in two parts, 202 and 38858, that added together give a triangular number (39060 = T₂₇₉).

The spelling of 20238858 in words is "twenty million, two hundred thirty-eight thousand, eight hundred fifty-eight".