20307442 has 8 divisors (see below), whose sum is σ = 30538332. Its totient is φ = 10128000.

The previous prime is 20307439. The next prime is 20307457. The reversal of 20307442 is 24470302.

It can be written as a sum of positive squares in 2 ways, for example, as 15515721 + 4791721 = 3939^2 + 2189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11859 + ... + 13462.

Almost surely, 2^20307442 is an apocalyptic number.

20307442 is a deficient number, since it is larger than the sum of its proper divisors (10230890).

20307442 is a wasteful number, since it uses less digits than its factorization.

20307442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25724.

The product of its (nonzero) digits is 1344, while the sum is 22.

The square root of 20307442 is about 4506.3779246752. The cubic root of 20307442 is about 272.8255716434.

Adding to 20307442 its reverse (24470302), we get a palindrome (44777744).

The spelling of 20307442 in words is "twenty million, three hundred seven thousand, four hundred forty-two".