20218489579 has 2 divisors, whose sum is σ = 20218489580. Its totient is φ = 20218489578.

The previous prime is 20218489573. The next prime is 20218489597. The reversal of 20218489579 is 97598481202.

Together with next prime (20218489597) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20218489579 - 2⁷ = 20218489451 is a prime.

It is a super-2 number, since 2×20218489579² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20218489573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10109244789 + 10109244790.

It is an arithmetic number, because the mean of its divisors is an integer number (10109244790).

Almost surely, 2^20218489579 is an apocalyptic number.

20218489579 is a deficient number, since it is larger than the sum of its proper divisors (1).

20218489579 is an equidigital number, since it uses as much as digits as its factorization.

20218489579 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 20218489579 in words is "twenty billion, two hundred eighteen million, four hundred eighty-nine thousand, five hundred seventy-nine".