20615242 has 4 divisors (see below), whose sum is σ = 30922866. Its totient is φ = 10307620.

The previous prime is 20615233. The next prime is 20615261. The reversal of 20615242 is 24251602.

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., 18567481 + 2047761 = 4309^2 + 1431^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5153809 + ... + 5153812.

Almost surely, 2^20615242 is an apocalyptic number.

20615242 is a deficient number, since it is larger than the sum of its proper divisors (10307624).

20615242 is a wasteful number, since it uses less digits than its factorization.

20615242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10307623.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20615242 is about 4540.4010836048. The cubic root of 20615242 is about 274.1970717145.

Adding to 20615242 its reverse (24251602), we get a palindrome (44866844).

The spelling of 20615242 in words is "twenty million, six hundred fifteen thousand, two hundred forty-two".