20764490880 has 384 divisors, whose sum is σ = 81528094080. Its totient is φ = 4466638848.

The previous prime is 20764490843. The next prime is 20764490881. The reversal of 20764490880 is 8809446702.

It is a tau number, because it is divible by the number of its divisors (384).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (20764490881) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1592869 + ... + 1605851.

It is an arithmetic number, because the mean of its divisors is an integer number (212312745).

Almost surely, 2^20764490880 is an apocalyptic number.

20764490880 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 20764490880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40764047040).

20764490880 is an abundant number, since it is smaller than the sum of its proper divisors (60763603200).

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

20764490880 is a wasteful number, since it uses less digits than its factorization.

20764490880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13036 (or 13017 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 20764490880 in words is "twenty billion, seven hundred sixty-four million, four hundred ninety thousand, eight hundred eighty".