20295406978 has 32 divisors (see below), whose sum is σ = 37963214208. Its totient is φ = 7905600000.

The previous prime is 20295406949. The next prime is 20295406997. The reversal of 20295406978 is 87960459202.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 890728 + ... + 913228.

It is an arithmetic number, because the mean of its divisors is an integer number (1186350444).

Almost surely, 2^20295406978 is an apocalyptic number.

20295406978 is a deficient number, since it is larger than the sum of its proper divisors (17667807230).

20295406978 is a wasteful number, since it uses less digits than its factorization.

20295406978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28378.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 20295406978 in words is "twenty billion, two hundred ninety-five million, four hundred six thousand, nine hundred seventy-eight".