20251337491 has 16 divisors (see below), whose sum is σ = 25835597568. Its totient is φ = 15413277600.

The previous prime is 20251337461. The next prime is 20251337497. The reversal of 20251337491 is 19473315202.

It is not a de Polignac number, because 20251337491 - 2¹¹ = 20251335443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20251337491.

It is not an unprimeable number, because it can be changed into a prime (20251337497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3054880 + ... + 3061501.

It is an arithmetic number, because the mean of its divisors is an integer number (1614724848).

Almost surely, 2^20251337491 is an apocalyptic number.

20251337491 is a deficient number, since it is larger than the sum of its proper divisors (5584260077).

20251337491 is a wasteful number, since it uses less digits than its factorization.

20251337491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6116442.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 20251337491 in words is "twenty billion, two hundred fifty-one million, three hundred thirty-seven thousand, four hundred ninety-one".