20879390280 has 256 divisors, whose sum is σ = 73240588800. Its totient is φ = 4662927360.

The previous prime is 20879390267. The next prime is 20879390347. The reversal of 20879390280 is 8209397802.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12509286 + ... + 12510954.

It is an arithmetic number, because the mean of its divisors is an integer number (286096050).

Almost surely, 2^20879390280 is an apocalyptic number.

20879390280 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 20879390280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36620294400).

20879390280 is an abundant number, since it is smaller than the sum of its proper divisors (52361198520).

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

20879390280 is a wasteful number, since it uses less digits than its factorization.

20879390280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024 (or 2020 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 20879390280 in words is "twenty billion, eight hundred seventy-nine million, three hundred ninety thousand, two hundred eighty".