20021697696 has 864 divisors, whose sum is σ = 75367563264. Its totient is φ = 4546713600.

The previous prime is 20021697671. The next prime is 20021697713. The reversal of 20021697696 is 69679612002.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 425993545 + ... + 425993591.

It is an arithmetic number, because the mean of its divisors is an integer number (87230976).

Almost surely, 2^20021697696 is an apocalyptic number.

20021697696 is a gapful number since it is divisible by the number (26) 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 20021697696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37683781632).

20021697696 is an abundant number, since it is smaller than the sum of its proper divisors (55345865568).

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

20021697696 is a wasteful number, since it uses less digits than its factorization.

20021697696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

It can be divided in two parts, 20021 and 697696, that added together give a palindrome (717717).

The spelling of 20021697696 in words is "twenty billion, twenty-one million, six hundred ninety-seven thousand, six hundred ninety-six".