20642242 has 4 divisors (see below), whose sum is σ = 30963366. Its totient is φ = 10321120.

The previous prime is 20642239. The next prime is 20642257. The reversal of 20642242 is 24224602.

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., 16638241 + 4004001 = 4079^2 + 2001^2 .

It is a super-2 number, since 2×20642242² = 852204309573128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5160559 + ... + 5160562.

Almost surely, 2^20642242 is an apocalyptic number.

20642242 is a deficient number, since it is larger than the sum of its proper divisors (10321124).

20642242 is a wasteful number, since it uses less digits than its factorization.

20642242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10321123.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 20642242 is about 4543.3734163064. The cubic root of 20642242 is about 274.3167257585.

Adding to 20642242 its reverse (24224602), we get a palindrome (44866844).

The spelling of 20642242 in words is "twenty million, six hundred forty-two thousand, two hundred forty-two".