20454591 has 4 divisors (see below), whose sum is σ = 27272792. Its totient is φ = 13636392.

The previous prime is 20454589. The next prime is 20454593. The reversal of 20454591 is 19545402.

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

It is an interprime number because it is at equal distance from previous prime (20454589) and next prime (20454593).

It is not a de Polignac number, because 20454591 - 2¹ = 20454589 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 (20454593) 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, 3409096 + ... + 3409101.

It is an arithmetic number, because the mean of its divisors is an integer number (6818198).

Almost surely, 2^20454591 is an apocalyptic number.

20454591 is a deficient number, since it is larger than the sum of its proper divisors (6818201).

20454591 is an equidigital number, since it uses as much as digits as its factorization.

20454591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6818200.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 20454591 is about 4522.6752039031. The cubic root of 20454591 is about 273.4829567813.

Adding to 20454591 its reverse (19545402), we get a palindrome (39999993).

The spelling of 20454591 in words is "twenty million, four hundred fifty-four thousand, five hundred ninety-one".