20578261766 has 8 divisors (see below), whose sum is σ = 31173010704. Its totient is φ = 10187258200.

The previous prime is 20578261763. The next prime is 20578261829. The reversal of 20578261766 is 66716287502.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20578261763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50936090 + ... + 50936493.

It is an arithmetic number, because the mean of its divisors is an integer number (3896626338).

Almost surely, 2^20578261766 is an apocalyptic number.

20578261766 is a deficient number, since it is larger than the sum of its proper divisors (10594748938).

20578261766 is a wasteful number, since it uses less digits than its factorization.

20578261766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101872686.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 20578261766 in words is "twenty billion, five hundred seventy-eight million, two hundred sixty-one thousand, seven hundred sixty-six".