20438902880 has 96 divisors (see below), whose sum is σ = 52992817920. Its totient is φ = 7387717120.

The previous prime is 20438902877. The next prime is 20438902901. The reversal of 20438902880 is 8820983402.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259151 + ... + 328689.

It is an arithmetic number, because the mean of its divisors is an integer number (552008520).

Almost surely, 2^20438902880 is an apocalyptic number.

20438902880 is a gapful number since it is divisible by the number (20) 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 20438902880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26496408960).

20438902880 is an abundant number, since it is smaller than the sum of its proper divisors (32553915040).

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

20438902880 is a wasteful number, since it uses less digits than its factorization.

20438902880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69732 (or 69724 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 20438902880 in words is "twenty billion, four hundred thirty-eight million, nine hundred two thousand, eight hundred eighty".