20402330 has 16 divisors (see below), whose sum is σ = 39549384. Its totient is φ = 7533120.

The previous prime is 20402321. The next prime is 20402351. The reversal of 20402330 is 3320402.

It can be written as a sum of positive squares in 4 ways, for example, as 12623809 + 7778521 = 3553^2 + 2789^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78341 + ... + 78600.

Almost surely, 2^20402330 is an apocalyptic number.

20402330 is a deficient number, since it is larger than the sum of its proper divisors (19147054).

20402330 is a wasteful number, since it uses less digits than its factorization.

20402330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156961.

The product of its (nonzero) digits is 144, while the sum is 14.

The square root of 20402330 is about 4516.8938442253. The cubic root of 20402330 is about 273.2498439569.

Adding to 20402330 its reverse (3320402), we get a palindrome (23722732).

The spelling of 20402330 in words is "twenty million, four hundred two thousand, three hundred thirty".