20331402 has 64 divisors (see below), whose sum is σ = 52254720. Its totient is φ = 5125824.

The previous prime is 20331373. The next prime is 20331403. The reversal of 20331402 is 20413302.

It is not an unprimeable number, because it can be changed into a prime (20331403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11749 + ... + 13367.

It is an arithmetic number, because the mean of its divisors is an integer number (816480).

Almost surely, 2^20331402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20331402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26127360).

20331402 is an abundant number, since it is smaller than the sum of its proper divisors (31923318).

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

20331402 is a wasteful number, since it uses less digits than its factorization.

20331402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20331402 is about 4509.0355953352. The cubic root of 20331402 is about 272.9328284066.

Adding to 20331402 its reverse (20413302), we get a palindrome (40744704).

The spelling of 20331402 in words is "twenty million, three hundred thirty-one thousand, four hundred two".