20874797533 has 2 divisors, whose sum is σ = 20874797534. Its totient is φ = 20874797532.

The previous prime is 20874797527. The next prime is 20874797551. The reversal of 20874797533 is 33579747802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17603186329 + 3271611204 = 132677^2 + 57198^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20874797533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20874717533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10437398766 + 10437398767.

It is an arithmetic number, because the mean of its divisors is an integer number (10437398767).

Almost surely, 2^20874797533 is an apocalyptic number.

It is an amenable number.

20874797533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20874797533 is an equidigital number, since it uses as much as digits as its factorization.

20874797533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8890560, while the sum is 55.

The spelling of 20874797533 in words is "twenty billion, eight hundred seventy-four million, seven hundred ninety-seven thousand, five hundred thirty-three".