20280323280 has 320 divisors, whose sum is σ = 74134683648. Its totient is φ = 4490188800.

The previous prime is 20280323269. The next prime is 20280323317. The reversal of 20280323280 is 8232308202.

It is a Cunningham number, because it is equal to 142409²-1.

It is a super-2 number, since 2×20280323280² (a number of 21 digits) contains 22 as substring.

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

It is a congruent 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, 7973689 + ... + 7976231.

Almost surely, 2^20280323280 is an apocalyptic number.

20280323280 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 20280323280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37067341824).

20280323280 is an abundant number, since it is smaller than the sum of its proper divisors (53854360368).

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

20280323280 is a wasteful number, since it uses less digits than its factorization.

20280323280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2714 (or 2708 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The spelling of 20280323280 in words is "twenty billion, two hundred eighty million, three hundred twenty-three thousand, two hundred eighty".