20321304780 has 96 divisors (see below), whose sum is σ = 66614284800. Its totient is φ = 4531576320.

The previous prime is 20321304767. The next prime is 20321304797. The reversal of 20321304780 is 8740312302.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 31 ways as a sum of consecutive naturals, for example, 572830 + ... + 607269.

It is an arithmetic number, because the mean of its divisors is an integer number (693898800).

Almost surely, 2^20321304780 is an apocalyptic number.

20321304780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20321304780 is an abundant number, since it is smaller than the sum of its proper divisors (46292980020).

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

20321304780 is a wasteful number, since it uses less digits than its factorization.

20321304780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180159 (or 1180157 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The spelling of 20321304780 in words is "twenty billion, three hundred twenty-one million, three hundred four thousand, seven hundred eighty".