20372491 has 2 divisors, whose sum is σ = 20372492. Its totient is φ = 20372490.

The previous prime is 20372483. The next prime is 20372507. The reversal of 20372491 is 19427302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20372491 - 2³ = 20372483 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20372461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10186245 + 10186246.

It is an arithmetic number, because the mean of its divisors is an integer number (10186246).

Almost surely, 2^20372491 is an apocalyptic number.

20372491 is a deficient number, since it is larger than the sum of its proper divisors (1).

20372491 is an equidigital number, since it uses as much as digits as its factorization.

20372491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20372491 is about 4513.5895914449. The cubic root of 20372491 is about 273.1165670184.

Adding to 20372491 its reverse (19427302), we get a palindrome (39799793).

The spelling of 20372491 in words is "twenty million, three hundred seventy-two thousand, four hundred ninety-one".