20978166044 has 48 divisors (see below), whose sum is σ = 41694518880. Its totient is φ = 9147989760.

The previous prime is 20978166043. The next prime is 20978166047. The reversal of 20978166044 is 44066187902.

It is a self number, because there is not a number n which added to its sum of digits gives 20978166044.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20978166043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147974 + ... + 252690.

It is an arithmetic number, because the mean of its divisors is an integer number (868635810).

Almost surely, 2^20978166044 is an apocalyptic number.

It is an amenable number.

20978166044 is a deficient number, since it is larger than the sum of its proper divisors (20716352836).

20978166044 is a wasteful number, since it uses less digits than its factorization.

20978166044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104918 (or 104916 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 20978166044 in words is "twenty billion, nine hundred seventy-eight million, one hundred sixty-six thousand, forty-four".