20545707437 has 6 divisors (see below), whose sum is σ = 21683974158. Its totient is φ = 19464354072.

The previous prime is 20545707397. The next prime is 20545707451. The reversal of 20545707437 is 73470754502.

It can be written as a sum of positive squares in only one way, i.e., 17886655081 + 2659052356 = 133741^2 + 51566^2 .

It is not a de Polignac number, because 20545707437 - 2²² = 20541513133 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 (20545707937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28456298 + ... + 28457019.

It is an arithmetic number, because the mean of its divisors is an integer number (3613995693).

Almost surely, 2^20545707437 is an apocalyptic number.

It is an amenable number.

20545707437 is a deficient number, since it is larger than the sum of its proper divisors (1138266721).

20545707437 is an equidigital number, since it uses as much as digits as its factorization.

20545707437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56913355 (or 56913336 counting only the distinct ones).

The product of its (nonzero) digits is 823200, while the sum is 44.

The spelling of 20545707437 in words is "twenty billion, five hundred forty-five million, seven hundred seven thousand, four hundred thirty-seven".