20631604402 has 4 divisors (see below), whose sum is σ = 30947406606. Its totient is φ = 10315802200.

The previous prime is 20631604393. The next prime is 20631604421. The reversal of 20631604402 is 20440613602.

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., 20355014241 + 276590161 = 142671^2 + 16631^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5157901099 + ... + 5157901102.

Almost surely, 2^20631604402 is an apocalyptic number.

20631604402 is a deficient number, since it is larger than the sum of its proper divisors (10315802204).

20631604402 is a wasteful number, since it uses less digits than its factorization.

20631604402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10315802203.

The product of its (nonzero) digits is 6912, while the sum is 28.

The spelling of 20631604402 in words is "twenty billion, six hundred thirty-one million, six hundred four thousand, four hundred two".