20901242 has 4 divisors (see below), whose sum is σ = 31351866. Its totient is φ = 10450620.

The previous prime is 20901241. The next prime is 20901247. The reversal of 20901242 is 24210902.

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., 13830961 + 7070281 = 3719^2 + 2659^2 .

It is not an unprimeable number, because it can be changed into a prime (20901241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5225309 + ... + 5225312.

Almost surely, 2^20901242 is an apocalyptic number.

20901242 is a deficient number, since it is larger than the sum of its proper divisors (10450624).

20901242 is a wasteful number, since it uses less digits than its factorization.

20901242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10450623.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20901242 is about 4571.7876153645. The cubic root of 20901242 is about 275.4592524521.

The spelling of 20901242 in words is "twenty million, nine hundred one thousand, two hundred forty-two".