20202020019978 has 16 divisors (see below), whose sum is σ = 40890835704096. Its totient is φ = 6652874062640.

The previous prime is 20202020019953. The next prime is 20202020020031. The reversal of 20202020019978 is 87991002020202.

It is a super-2 number, since 2×20202020019978² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20283152133 + ... + 20283153128.

It is an arithmetic number, because the mean of its divisors is an integer number (2555677231506).

Almost surely, 2^{20202020019978} is an apocalyptic number.

20202020019978 is an abundant number, since it is smaller than the sum of its proper divisors (20688815684118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20202020019978 is a wasteful number, since it uses less digits than its factorization.

20202020019978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40566305349.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 20202020019978 in words is "twenty trillion, two hundred two billion, twenty million, nineteen thousand, nine hundred seventy-eight".