20907242 has 16 divisors (see below), whose sum is σ = 31795200. Its totient is φ = 10310160.

The previous prime is 20907221. The next prime is 20907247. The reversal of 20907242 is 24270902.

It is a super-2 number, since 2×20907242² = 874225536093128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20907247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87359 + ... + 87597.

It is an arithmetic number, because the mean of its divisors is an integer number (1987200).

Almost surely, 2^20907242 is an apocalyptic number.

20907242 is a deficient number, since it is larger than the sum of its proper divisors (10887958).

20907242 is a wasteful number, since it uses less digits than its factorization.

20907242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20907242 is about 4572.4437667401. The cubic root of 20907242 is about 275.4856081010.

The spelling of 20907242 in words is "twenty million, nine hundred seven thousand, two hundred forty-two".