20400466 has 8 divisors (see below), whose sum is σ = 30650364. Its totient is φ = 10183680.

The previous prime is 20400463. The next prime is 20400467. The reversal of 20400466 is 66400402.

It can be written as a sum of positive squares in 2 ways, for example, as 17264025 + 3136441 = 4155^2 + 1771^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20400463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6675 + ... + 9238.

Almost surely, 2^20400466 is an apocalyptic number.

20400466 is a deficient number, since it is larger than the sum of its proper divisors (10249898).

20400466 is a wasteful number, since it uses less digits than its factorization.

20400466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16556.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20400466 is about 4516.6875030270. The cubic root of 20400466 is about 273.2415221423.

Adding to 20400466 its reverse (66400402), we get a palindrome (86800868).

The spelling of 20400466 in words is "twenty million, four hundred thousand, four hundred sixty-six".