20542442 has 4 divisors (see below), whose sum is σ = 30813666. Its totient is φ = 10271220.

The previous prime is 20542399. The next prime is 20542447. The reversal of 20542442 is 24424502.

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

It can be written as a sum of positive squares in only one way, i.e., 15062161 + 5480281 = 3881^2 + 2341^2 .

It is not an unprimeable number, because it can be changed into a prime (20542447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5135609 + ... + 5135612.

Almost surely, 2^20542442 is an apocalyptic number.

20542442 is a deficient number, since it is larger than the sum of its proper divisors (10271224).

20542442 is a wasteful number, since it uses less digits than its factorization.

20542442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10271223.

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 20542442 is about 4532.3770805175. The cubic root of 20542442 is about 273.8739274731.

Adding to 20542442 its reverse (24424502), we get a palindrome (44966944).

The spelling of 20542442 in words is "twenty million, five hundred forty-two thousand, four hundred forty-two".