20303442 has 12 divisors (see below), whose sum is σ = 43990830. Its totient is φ = 6767808.

The previous prime is 20303441. The next prime is 20303447. The reversal of 20303442 is 24430302.

It can be written as a sum of positive squares in only one way, i.e., 18584721 + 1718721 = 4311^2 + 1311^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1127969 = 20303442 / (2 + 0 + 3 + 0 + 3 + 4 + 4 + 2).

It is not an unprimeable number, because it can be changed into a prime (20303441) 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 5 ways as a sum of consecutive naturals, for example, 563967 + ... + 564002.

Almost surely, 2^20303442 is an apocalyptic number.

20303442 is an abundant number, since it is smaller than the sum of its proper divisors (23687388).

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

20303442 is a wasteful number, since it uses less digits than its factorization.

20303442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127977 (or 1127974 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 20303442 is about 4505.9340874007. The cubic root of 20303442 is about 272.8076574563.

Adding to 20303442 its reverse (24430302), we get a palindrome (44733744).

The spelling of 20303442 in words is "twenty million, three hundred three thousand, four hundred forty-two".