20446400 has 84 divisors (see below), whose sum is σ = 54236112. Its totient is φ = 7541760.

The previous prime is 20446399. The next prime is 20446411. The reversal of 20446400 is 464402.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20309 + ... + 21291.

It is an arithmetic number, because the mean of its divisors is an integer number (645668).

Almost surely, 2^20446400 is an apocalyptic number.

20446400 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 20446400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27118056).

20446400 is an abundant number, since it is smaller than the sum of its proper divisors (33789712).

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

20446400 is a wasteful number, since it uses less digits than its factorization.

20446400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018 (or 1003 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 20446400 is about 4521.7695651150. The cubic root of 20446400 is about 273.4464466733.

The spelling of 20446400 in words is "twenty million, four hundred forty-six thousand, four hundred".