20988630 has 48 divisors (see below), whose sum is σ = 58771440. Its totient is φ = 5166144.

The previous prime is 20988629. The next prime is 20988637. The reversal of 20988630 is 3688902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20988637) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7800 + ... + 10139.

It is an arithmetic number, because the mean of its divisors is an integer number (1224405).

Almost surely, 2^20988630 is an apocalyptic number.

20988630 is an abundant number, since it is smaller than the sum of its proper divisors (37782810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20988630 is a wasteful number, since it uses less digits than its factorization.

20988630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17965 (or 17962 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20988630 is about 4581.3349582845. The cubic root of 20988630 is about 275.8426166366.

The spelling of 20988630 in words is "twenty million, nine hundred eighty-eight thousand, six hundred thirty".