20995676280 has 384 divisors, whose sum is σ = 74346854400. Its totient is φ = 5321894400.

The previous prime is 20995676239. The next prime is 20995676291. The reversal of 20995676280 is 8267659902.

20995676280 is a `hidden beast` number, since 2 + 0 + 9 + 9 + 5 + 6 + 7 + 628 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17777290 + ... + 17778470.

It is an arithmetic number, because the mean of its divisors is an integer number (193611600).

Almost surely, 2^20995676280 is an apocalyptic number.

20995676280 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 20995676280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37173427200).

20995676280 is an abundant number, since it is smaller than the sum of its proper divisors (53351178120).

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

20995676280 is a wasteful number, since it uses less digits than its factorization.

20995676280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297 (or 1281 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 20995676280 in words is "twenty billion, nine hundred ninety-five million, six hundred seventy-six thousand, two hundred eighty".