102020019979 has 8 divisors (see below), whose sum is σ = 104194462320. Its totient is φ = 99860420736.

The previous prime is 102020019977. The next prime is 102020020001. The reversal of 102020019979 is 979910020201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 102020019979 - 2¹ = 102020019977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102020019977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3696882 + ... + 3724375.

It is an arithmetic number, because the mean of its divisors is an integer number (13024307790).

Almost surely, 2^102020019979 is an apocalyptic number.

102020019979 is a deficient number, since it is larger than the sum of its proper divisors (2174442341).

102020019979 is an equidigital number, since it uses as much as digits as its factorization.

102020019979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7421549.

The product of its (nonzero) digits is 20412, while the sum is 40.

The spelling of 102020019979 in words is "one hundred two billion, twenty million, nineteen thousand, nine hundred seventy-nine".