20566992378 has 32 divisors (see below), whose sum is σ = 41609782080. Its totient is φ = 6776415360.

The previous prime is 20566992359. The next prime is 20566992389. The reversal of 20566992378 is 87329966502.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2771493 + ... + 2778903.

It is an arithmetic number, because the mean of its divisors is an integer number (1300305690).

Almost surely, 2^20566992378 is an apocalyptic number.

20566992378 is an abundant number, since it is smaller than the sum of its proper divisors (21042789702).

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

20566992378 is a wasteful number, since it uses less digits than its factorization.

20566992378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12702.

The product of its (nonzero) digits is 9797760, while the sum is 57.

The spelling of 20566992378 in words is "twenty billion, five hundred sixty-six million, nine hundred ninety-two thousand, three hundred seventy-eight".