20951927280 has 240 divisors, whose sum is σ = 73554863616. Its totient is φ = 5334658560.

The previous prime is 20951927273. The next prime is 20951927309. The reversal of 20951927280 is 8272915902.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16079109 + ... + 16080411.

Almost surely, 2^20951927280 is an apocalyptic number.

20951927280 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 20951927280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36777431808).

20951927280 is an abundant number, since it is smaller than the sum of its proper divisors (52602936336).

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

20951927280 is a wasteful number, since it uses less digits than its factorization.

20951927280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2316 (or 2307 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 20951927280 in words is "twenty billion, nine hundred fifty-one million, nine hundred twenty-seven thousand, two hundred eighty".