20558942 has 4 divisors (see below), whose sum is σ = 30838416. Its totient is φ = 10279470.

The previous prime is 20558929. The next prime is 20558953. The reversal of 20558942 is 24985502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5139734 + ... + 5139737.

It is an arithmetic number, because the mean of its divisors is an integer number (7709604).

Almost surely, 2^20558942 is an apocalyptic number.

20558942 is a deficient number, since it is larger than the sum of its proper divisors (10279474).

20558942 is a wasteful number, since it uses less digits than its factorization.

20558942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10279473.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 20558942 is about 4534.1969520523. The cubic root of 20558942 is about 273.9472344093.

The spelling of 20558942 in words is "twenty million, five hundred fifty-eight thousand, nine hundred forty-two".