20631634 has 8 divisors (see below), whose sum is σ = 31126860. Its totient is φ = 10256016.

The previous prime is 20631619. The next prime is 20631641. The reversal of 20631634 is 43613602.

It can be written as a sum of positive squares in 2 ways, for example, as 19316025 + 1315609 = 4395^2 + 1147^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20631599 and 20631608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29469 + ... + 30160.

Almost surely, 2^20631634 is an apocalyptic number.

20631634 is a deficient number, since it is larger than the sum of its proper divisors (10495226).

20631634 is a wasteful number, since it uses less digits than its factorization.

20631634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59804.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20631634 is about 4542.2058517861. The cubic root of 20631634 is about 274.2697274650.

The spelling of 20631634 in words is "twenty million, six hundred thirty-one thousand, six hundred thirty-four".