20402466 has 64 divisors (see below), whose sum is σ = 50488320. Its totient is φ = 5365440.

The previous prime is 20402443. The next prime is 20402467. The reversal of 20402466 is 66420402.

20402466 is nontrivially palindromic in base 12.

It is not an unprimeable number, because it can be changed into a prime (20402467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29181 + ... + 29871.

It is an arithmetic number, because the mean of its divisors is an integer number (788880).

Almost surely, 2^20402466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20402466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25244160).

20402466 is an abundant number, since it is smaller than the sum of its proper divisors (30085854).

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

20402466 is a wasteful number, since it uses less digits than its factorization.

20402466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 20402466 is about 4516.9088987935. The cubic root of 20402466 is about 273.2504511080.

Adding to 20402466 its reverse (66420402), we get a palindrome (86822868).

The spelling of 20402466 in words is "twenty million, four hundred two thousand, four hundred sixty-six".