20005430402 has 4 divisors (see below), whose sum is σ = 30008145606. Its totient is φ = 10002715200.

The previous prime is 20005430351. The next prime is 20005430411. The reversal of 20005430402 is 20403450002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18591595201 + 1413835201 = 136351^2 + 37601^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5001357599 + ... + 5001357602.

Almost surely, 2^20005430402 is an apocalyptic number.

20005430402 is a deficient number, since it is larger than the sum of its proper divisors (10002715204).

20005430402 is a wasteful number, since it uses less digits than its factorization.

20005430402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10002715203.

The product of its (nonzero) digits is 960, while the sum is 20.

Adding to 20005430402 its reverse (20403450002), we get a palindrome (40408880404).

The spelling of 20005430402 in words is "twenty billion, five million, four hundred thirty thousand, four hundred two".