20337449287 has 2 divisors, whose sum is σ = 20337449288. Its totient is φ = 20337449286.

The previous prime is 20337449261. The next prime is 20337449339. The reversal of 20337449287 is 78294473302.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20337449287 is a prime.

It is a super-2 number, since 2×20337449287² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20337449287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20337449887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10168724643 + 10168724644.

It is an arithmetic number, because the mean of its divisors is an integer number (10168724644).

Almost surely, 2^20337449287 is an apocalyptic number.

20337449287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20337449287 is an equidigital number, since it uses as much as digits as its factorization.

20337449287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 49.

The spelling of 20337449287 in words is "twenty billion, three hundred thirty-seven million, four hundred forty-nine thousand, two hundred eighty-seven".