20430403442 has 8 divisors (see below), whose sum is σ = 31473864876. Its totient is φ = 9939115152.

The previous prime is 20430403439. The next prime is 20430403481. The reversal of 20430403442 is 24430403402.

It can be written as a sum of positive squares in 2 ways, for example, as 19401982681 + 1028420761 = 139291^2 + 32069^2 .

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, 138043193 + ... + 138043340.

Almost surely, 2^20430403442 is an apocalyptic number.

20430403442 is a deficient number, since it is larger than the sum of its proper divisors (11043461434).

20430403442 is a wasteful number, since it uses less digits than its factorization.

20430403442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276086572.

The product of its (nonzero) digits is 9216, while the sum is 26.

Adding to 20430403442 its reverse (24430403402), we get a palindrome (44860806844).

The spelling of 20430403442 in words is "twenty billion, four hundred thirty million, four hundred three thousand, four hundred forty-two".