20904703213 has 2 divisors, whose sum is σ = 20904703214. Its totient is φ = 20904703212.

The previous prime is 20904703199. The next prime is 20904703271. The reversal of 20904703213 is 31230740902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11300115204 + 9604588009 = 106302^2 + 98003^2 .

It is a cyclic number.

It is not a de Polignac number, because 20904703213 - 2²⁹ = 20367832301 is a prime.

It is a super-2 number, since 2×20904703213² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20904703613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10452351606 + 10452351607.

It is an arithmetic number, because the mean of its divisors is an integer number (10452351607).

Almost surely, 2^20904703213 is an apocalyptic number.

It is an amenable number.

20904703213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20904703213 is an equidigital number, since it uses as much as digits as its factorization.

20904703213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The spelling of 20904703213 in words is "twenty billion, nine hundred four million, seven hundred three thousand, two hundred thirteen".