20976843888 has 640 divisors, whose sum is σ = 81594777600. Its totient is φ = 4982860800.

The previous prime is 20976843887. The next prime is 20976843889. The reversal of 20976843888 is 88834867902.

It is an interprime number because it is at equal distance from previous prime (20976843887) and next prime (20976843889).

It is a super-3 number, since 3×20976843888³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20976843887) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 77405193 + ... + 77405463.

It is an arithmetic number, because the mean of its divisors is an integer number (127491840).

Almost surely, 2^20976843888 is an apocalyptic number.

20976843888 is a gapful number since it is divisible by the number (28) 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 20976843888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40797388800).

20976843888 is an abundant number, since it is smaller than the sum of its proper divisors (60617933712).

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

20976843888 is a wasteful number, since it uses less digits than its factorization.

20976843888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 63.

The spelling of 20976843888 in words is "twenty billion, nine hundred seventy-six million, eight hundred forty-three thousand, eight hundred eighty-eight".