20631857630 has 8 divisors (see below), whose sum is σ = 37137343752. Its totient is φ = 8252743048.

The previous prime is 20631857629. The next prime is 20631857633. The reversal of 20631857630 is 3675813602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20631857633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1031592872 + ... + 1031592891.

It is an arithmetic number, because the mean of its divisors is an integer number (4642167969).

Almost surely, 2^20631857630 is an apocalyptic number.

20631857630 is a deficient number, since it is larger than the sum of its proper divisors (16505486122).

20631857630 is a wasteful number, since it uses less digits than its factorization.

20631857630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063185770.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 20631857630 in words is "twenty billion, six hundred thirty-one million, eight hundred fifty-seven thousand, six hundred thirty".