20734005997 has 2 divisors, whose sum is σ = 20734005998. Its totient is φ = 20734005996.

The previous prime is 20734005989. The next prime is 20734006043. The reversal of 20734005997 is 79950043702.

It is an a-pointer prime, because the next prime (20734006043) can be obtained adding 20734005997 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16150851396 + 4583154601 = 127086^2 + 67699^2 .

It is a cyclic number.

It is not a de Polignac number, because 20734005997 - 2³ = 20734005989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20734005907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10367002998 + 10367002999.

It is an arithmetic number, because the mean of its divisors is an integer number (10367002999).

Almost surely, 2^20734005997 is an apocalyptic number.

It is an amenable number.

20734005997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20734005997 is an equidigital number, since it uses as much as digits as its factorization.

20734005997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 46.

The spelling of 20734005997 in words is "twenty billion, seven hundred thirty-four million, five thousand, nine hundred ninety-seven".