20197847579 has 24 divisors (see below), whose sum is σ = 25505661600. Its totient is φ = 15980668704.

The previous prime is 20197847573. The next prime is 20197847581. The reversal of 20197847579 is 97574879102.

It is not a de Polignac number, because 20197847579 - 2¹⁶ = 20197782043 is a prime.

It is a super-2 number, since 2×20197847579² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20197847573) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116252 + ... + 232185.

It is an arithmetic number, because the mean of its divisors is an integer number (1062735900).

Almost surely, 2^20197847579 is an apocalyptic number.

20197847579 is a deficient number, since it is larger than the sum of its proper divisors (5307814021).

20197847579 is an equidigital number, since it uses as much as digits as its factorization.

20197847579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348484 (or 348457 counting only the distinct ones).

The product of its (nonzero) digits is 8890560, while the sum is 59.

The spelling of 20197847579 in words is "twenty billion, one hundred ninety-seven million, eight hundred forty-seven thousand, five hundred seventy-nine".