20893804506937 has 4 divisors (see below), whose sum is σ = 20899549301476. Its totient is φ = 20888059712400.

The previous prime is 20893804506931. The next prime is 20893804507001. The reversal of 20893804506937 is 73960540839802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1434272107321 + 19459532399616 = 1197611^2 + 4411296^2 .

It is a cyclic number.

It is not a de Polignac number, because 20893804506937 - 2²³ = 20893796118329 is a prime.

It is a super-2 number, since 2×20893804506937² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20893804506931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2872391814 + ... + 2872399087.

It is an arithmetic number, because the mean of its divisors is an integer number (5224887325369).

Almost surely, 2^{20893804506937} is an apocalyptic number.

It is an amenable number.

20893804506937 is a deficient number, since it is larger than the sum of its proper divisors (5744794539).

20893804506937 is an equidigital number, since it uses as much as digits as its factorization.

20893804506937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5744794538.

The product of its (nonzero) digits is 78382080, while the sum is 64.

The spelling of 20893804506937 in words is "twenty trillion, eight hundred ninety-three billion, eight hundred four million, five hundred six thousand, nine hundred thirty-seven".