20340928997 has 2 divisors, whose sum is σ = 20340928998. Its totient is φ = 20340928996.

The previous prime is 20340928987. The next prime is 20340929027. The reversal of 20340928997 is 79982904302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15029288836 + 5311640161 = 122594^2 + 72881^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20340928997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20340928957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170464498 + 10170464499.

It is an arithmetic number, because the mean of its divisors is an integer number (10170464499).

Almost surely, 2^20340928997 is an apocalyptic number.

It is an amenable number.

20340928997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20340928997 is an equidigital number, since it uses as much as digits as its factorization.

20340928997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The spelling of 20340928997 in words is "twenty billion, three hundred forty million, nine hundred twenty-eight thousand, nine hundred ninety-seven".