20958280980 has 720 divisors, whose sum is σ = 80320310784. Its totient is φ = 4054095360.

The previous prime is 20958280979. The next prime is 20958280991. The reversal of 20958280980 is 8908285902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 676073565 + ... + 676073595.

Almost surely, 2^20958280980 is an apocalyptic number.

20958280980 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 20958280980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40160155392).

20958280980 is an abundant number, since it is smaller than the sum of its proper divisors (59362029804).

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

20958280980 is a wasteful number, since it uses less digits than its factorization.

20958280980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 51.

The spelling of 20958280980 in words is "twenty billion, nine hundred fifty-eight million, two hundred eighty thousand, nine hundred eighty".