20099400 has 96 divisors (see below), whose sum is σ = 63016800. Its totient is φ = 5299200.

The previous prime is 20099383. The next prime is 20099419. The reversal of 20099400 is 499002.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83280 + ... + 83520.

It is an arithmetic number, because the mean of its divisors is an integer number (656425).

Almost surely, 2^20099400 is an apocalyptic number.

20099400 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 20099400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31508400).

20099400 is an abundant number, since it is smaller than the sum of its proper divisors (42917400).

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

20099400 is a wasteful number, since it uses less digits than its factorization.

20099400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20099400 is about 4483.2354388321. The cubic root of 20099400 is about 271.8907072442.

The spelling of 20099400 in words is "twenty million, ninety-nine thousand, four hundred".