20901442 has 4 divisors (see below), whose sum is σ = 31352166. Its totient is φ = 10450720.

The previous prime is 20901437. The next prime is 20901469. The reversal of 20901442 is 24410902.

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., 15374241 + 5527201 = 3921^2 + 2351^2 .

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, 5225359 + ... + 5225362.

Almost surely, 2^20901442 is an apocalyptic number.

20901442 is a deficient number, since it is larger than the sum of its proper divisors (10450724).

20901442 is a wasteful number, since it uses less digits than its factorization.

20901442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10450723.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20901442 is about 4571.8094885942. The cubic root of 20901442 is about 275.4601310550.

The spelling of 20901442 in words is "twenty million, nine hundred one thousand, four hundred forty-two".