20919052597 has 4 divisors (see below), whose sum is σ = 20924855776. Its totient is φ = 20913249420.

The previous prime is 20919052591. The next prime is 20919052607. The reversal of 20919052597 is 79525091902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20919052597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20919052597.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20919052591) 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, 2896179 + ... + 2903392.

It is an arithmetic number, because the mean of its divisors is an integer number (5231213944).

Almost surely, 2^20919052597 is an apocalyptic number.

It is an amenable number.

20919052597 is a deficient number, since it is larger than the sum of its proper divisors (5803179).

20919052597 is an equidigital number, since it uses as much as digits as its factorization.

20919052597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5803178.

The product of its (nonzero) digits is 510300, while the sum is 49.

The spelling of 20919052597 in words is "twenty billion, nine hundred nineteen million, fifty-two thousand, five hundred ninety-seven".