20969217900 has 144 divisors (see below), whose sum is σ = 68009709600. Its totient is φ = 5542225920.

The previous prime is 20969217889. The next prime is 20969217917. The reversal of 20969217900 is 971296902.

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

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, 270736 + ... + 339464.

It is an arithmetic number, because the mean of its divisors is an integer number (472289650).

Almost surely, 2^20969217900 is an apocalyptic number.

20969217900 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 20969217900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34004854800).

20969217900 is an abundant number, since it is smaller than the sum of its proper divisors (47040491700).

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

20969217900 is a wasteful number, since it uses less digits than its factorization.

20969217900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68865 (or 68852 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The spelling of 20969217900 in words is "twenty billion, nine hundred sixty-nine million, two hundred seventeen thousand, nine hundred".