20738437593917 has 2 divisors, whose sum is σ = 20738437593918. Its totient is φ = 20738437593916.

The previous prime is 20738437593823. The next prime is 20738437593931. The reversal of 20738437593917 is 71939573483702.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11686456754116 + 9051980839801 = 3418546^2 + 3008651^2 .

It is a cyclic number.

It is not a de Polignac number, because 20738437593917 - 2²² = 20738433399613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20738437593017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10369218796958 + 10369218796959.

It is an arithmetic number, because the mean of its divisors is an integer number (10369218796959).

Almost surely, 2^{20738437593917} is an apocalyptic number.

It is an amenable number.

20738437593917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20738437593917 is an equidigital number, since it uses as much as digits as its factorization.

20738437593917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240045120, while the sum is 68.

The spelling of 20738437593917 in words is "twenty trillion, seven hundred thirty-eight billion, four hundred thirty-seven million, five hundred ninety-three thousand, nine hundred seventeen".