20032291 has 4 divisors (see below), whose sum is σ = 20092072. Its totient is φ = 19972512.

The previous prime is 20032283. The next prime is 20032321. The reversal of 20032291 is 19223002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20032291 - 2³ = 20032283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20032261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29385 + ... + 30058.

It is an arithmetic number, because the mean of its divisors is an integer number (5023018).

Almost surely, 2^20032291 is an apocalyptic number.

20032291 is a deficient number, since it is larger than the sum of its proper divisors (59781).

20032291 is an equidigital number, since it uses as much as digits as its factorization.

20032291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59780.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 20032291 is about 4475.7447424982. The cubic root of 20032291 is about 271.5877685413.

Adding to 20032291 its reverse (19223002), we get a palindrome (39255293).

The spelling of 20032291 in words is "twenty million, thirty-two thousand, two hundred ninety-one".