20146591 has 2 divisors, whose sum is σ = 20146592. Its totient is φ = 20146590.

The previous prime is 20146573. The next prime is 20146627. The reversal of 20146591 is 19564102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20146591 - 2²¹ = 18049439 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20146991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10073295 + 10073296.

It is an arithmetic number, because the mean of its divisors is an integer number (10073296).

Almost surely, 2^20146591 is an apocalyptic number.

20146591 is a deficient number, since it is larger than the sum of its proper divisors (1).

20146591 is an equidigital number, since it uses as much as digits as its factorization.

20146591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20146591 is about 4488.4954049213. The cubic root of 20146591 is about 272.1033299380.

It can be divided in two parts, 20 and 146591, that added together give a triangular number (146611 = T₅₄₁).

The spelling of 20146591 in words is "twenty million, one hundred forty-six thousand, five hundred ninety-one".