20470400 has 48 divisors (see below), whose sum is σ = 50576190. Its totient is φ = 8186880.

The previous prime is 20470399. The next prime is 20470409. The reversal of 20470400 is 407402.

It can be written as a sum of positive squares in 3 ways, for example, as 8248384 + 12222016 = 2872^2 + 3496^2 .

It is not an unprimeable number, because it can be changed into a prime (20470409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2 + ... + 6398.

Almost surely, 2^20470400 is an apocalyptic number.

20470400 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 20470400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25288095).

20470400 is an abundant number, since it is smaller than the sum of its proper divisors (30105790).

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

20470400 is an equidigital number, since it uses as much as digits as its factorization.

20470400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6421 (or 6404 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 20470400 is about 4524.4226150969. The cubic root of 20470400 is about 273.5533953883.

Adding to 20470400 its reverse (407402), we get a palindrome (20877802).

The spelling of 20470400 in words is "twenty million, four hundred seventy thousand, four hundred".