20297935819 has 4 divisors (see below), whose sum is σ = 23197640944. Its totient is φ = 17398230696.

The previous prime is 20297935811. The next prime is 20297935831. The reversal of 20297935819 is 91853979202.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20297935819 - 2³ = 20297935811 is a prime.

It is a super-2 number, since 2×20297935819² (a number of 21 digits) contains 22 as substring.

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 20297935819.

It is not an unprimeable number, because it can be changed into a prime (20297935811) 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, 1449852552 + ... + 1449852565.

It is an arithmetic number, because the mean of its divisors is an integer number (5799410236).

Almost surely, 2^20297935819 is an apocalyptic number.

20297935819 is a deficient number, since it is larger than the sum of its proper divisors (2899705125).

20297935819 is an equidigital number, since it uses as much as digits as its factorization.

20297935819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2899705124.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 20297935819 in words is "twenty billion, two hundred ninety-seven million, nine hundred thirty-five thousand, eight hundred nineteen".