20850811400 has 96 divisors (see below), whose sum is σ = 49307201280. Its totient is φ = 8198400000.

The previous prime is 20850811367. The next prime is 20850811403. The reversal of 20850811400 is 411805802.

It is not an unprimeable number, because it can be changed into a prime (20850811403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5209400 + ... + 5213400.

It is an arithmetic number, because the mean of its divisors is an integer number (513616680).

Almost surely, 2^20850811400 is an apocalyptic number.

20850811400 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 20850811400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24653600640).

20850811400 is an abundant number, since it is smaller than the sum of its proper divisors (28456389880).

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

20850811400 is a wasteful number, since it uses less digits than its factorization.

20850811400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4455 (or 4446 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The spelling of 20850811400 in words is "twenty billion, eight hundred fifty million, eight hundred eleven thousand, four hundred".