20400200 has 24 divisors (see below), whose sum is σ = 47430930. Its totient is φ = 8160000.

The previous prime is 20400197. The next prime is 20400239. The reversal of 20400200 is 200402.

It can be written as a sum of positive squares in 3 ways, for example, as 9523396 + 10876804 = 3086^2 + 3298^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50801 + ... + 51200.

Almost surely, 2^20400200 is an apocalyptic number.

20400200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400200 is an abundant number, since it is smaller than the sum of its proper divisors (27030730).

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

20400200 is a wasteful number, since it uses less digits than its factorization.

20400200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102017 (or 102008 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 20400200 is about 4516.6580565724. The cubic root of 20400200 is about 273.2403345459.

Adding to 20400200 its reverse (200402), we get a palindrome (20600602).

The spelling of 20400200 in words is "twenty million, four hundred thousand, two hundred".