20291442 has 16 divisors (see below), whose sum is σ = 41527200. Its totient is φ = 6606432.

The previous prime is 20291437. The next prime is 20291443. The reversal of 20291442 is 24419202.

It is not an unprimeable number, because it can be changed into a prime (20291443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39067 + ... + 39582.

It is an arithmetic number, because the mean of its divisors is an integer number (2595450).

Almost surely, 2^20291442 is an apocalyptic number.

20291442 is an abundant number, since it is smaller than the sum of its proper divisors (21235758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20291442 is a wasteful number, since it uses less digits than its factorization.

20291442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78697.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20291442 is about 4504.6023131904. The cubic root of 20291442 is about 272.7539007738.

The spelling of 20291442 in words is "twenty million, two hundred ninety-one thousand, four hundred forty-two".