20963209400 has 144 divisors (see below), whose sum is σ = 57040880400. Its totient is φ = 7143790080.

The previous prime is 20963209387. The next prime is 20963209403. The reversal of 20963209400 is 490236902.

It is a super-2 number, since 2×20963209400² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20963209403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1630196 + ... + 1643004.

It is an arithmetic number, because the mean of its divisors is an integer number (396117225).

Almost surely, 2^20963209400 is an apocalyptic number.

20963209400 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 20963209400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28520440200).

20963209400 is an abundant number, since it is smaller than the sum of its proper divisors (36077671000).

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

20963209400 is a wasteful number, since it uses less digits than its factorization.

20963209400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13006 (or 12990 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 35.

The spelling of 20963209400 in words is "twenty billion, nine hundred sixty-three million, two hundred nine thousand, four hundred".