20762205978 has 32 divisors (see below), whose sum is σ = 43973202240. Its totient is φ = 6512718080.

The previous prime is 20762205953. The next prime is 20762205979. The reversal of 20762205978 is 87950226702.

It is not an unprimeable number, because it can be changed into a prime (20762205979) 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 15 ways as a sum of consecutive naturals, for example, 1352128 + ... + 1367396.

It is an arithmetic number, because the mean of its divisors is an integer number (1374162570).

Almost surely, 2^20762205978 is an apocalyptic number.

20762205978 is an abundant number, since it is smaller than the sum of its proper divisors (23210996262).

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

20762205978 is a wasteful number, since it uses less digits than its factorization.

20762205978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28622.

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 20762205978 in words is "twenty billion, seven hundred sixty-two million, two hundred five thousand, nine hundred seventy-eight".