20248391 has 4 divisors (see below), whose sum is σ = 20270592. Its totient is φ = 20226192.

The previous prime is 20248381. The next prime is 20248427. The reversal of 20248391 is 19384202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20248391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20248321) 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, 9671 + ... + 11576.

It is an arithmetic number, because the mean of its divisors is an integer number (5067648).

Almost surely, 2^20248391 is an apocalyptic number.

20248391 is a deficient number, since it is larger than the sum of its proper divisors (22201).

20248391 is an equidigital number, since it uses as much as digits as its factorization.

20248391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22200.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20248391 is about 4499.8212186708. The cubic root of 20248391 is about 272.5608696051.

The spelling of 20248391 in words is "twenty million, two hundred forty-eight thousand, three hundred ninety-one".