20321847504 has 120 divisors (see below), whose sum is σ = 65820668160. Its totient is φ = 5732722944.

The previous prime is 20321847443. The next prime is 20321847521. The reversal of 20321847504 is 40574812302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47967 + ... + 207230.

It is an arithmetic number, because the mean of its divisors is an integer number (548505568).

Almost surely, 2^20321847504 is an apocalyptic number.

20321847504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20321847504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32910334080).

20321847504 is an abundant number, since it is smaller than the sum of its proper divisors (45498820656).

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

20321847504 is a wasteful number, since it uses less digits than its factorization.

20321847504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255297 (or 255288 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The spelling of 20321847504 in words is "twenty billion, three hundred twenty-one million, eight hundred forty-seven thousand, five hundred four".