20434482978 has 32 divisors (see below), whose sum is σ = 50300267136. Its totient is φ = 5389314048.

The previous prime is 20434482973. The next prime is 20434482979. The reversal of 20434482978 is 87928443402.

It is a self number, because there is not a number n which added to its sum of digits gives 20434482978.

It is not an unprimeable number, because it can be changed into a prime (20434482973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18712351 + ... + 18713442.

It is an arithmetic number, because the mean of its divisors is an integer number (1571883348).

Almost surely, 2^20434482978 is an apocalyptic number.

20434482978 is an abundant number, since it is smaller than the sum of its proper divisors (29865784158).

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

20434482978 is a wasteful number, since it uses less digits than its factorization.

20434482978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37425818.

The product of its (nonzero) digits is 3096576, while the sum is 51.

The spelling of 20434482978 in words is "twenty billion, four hundred thirty-four million, four hundred eighty-two thousand, nine hundred seventy-eight".