20402266 has 8 divisors (see below), whose sum is σ = 30631104. Its totient is φ = 10191900.

The previous prime is 20402251. The next prime is 20402267. The reversal of 20402266 is 66220402.

It is a happy number.

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 (20402267) 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, 1410 + ... + 6541.

It is an arithmetic number, because the mean of its divisors is an integer number (3828888).

Almost surely, 2^20402266 is an apocalyptic number.

20402266 is a deficient number, since it is larger than the sum of its proper divisors (10228838).

20402266 is a wasteful number, since it uses less digits than its factorization.

20402266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9236.

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

The square root of 20402266 is about 4516.8867597052. The cubic root of 20402266 is about 273.2495582377.

Adding to 20402266 its reverse (66220402), we get a palindrome (86622668).

The spelling of 20402266 in words is "twenty million, four hundred two thousand, two hundred sixty-six".