20381632 has 28 divisors (see below), whose sum is σ = 41753536. Its totient is φ = 9861120.

The previous prime is 20381593. The next prime is 20381651. The reversal of 20381632 is 23618302.

It is a zygodrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 20381597 and 20381606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3153 + ... + 7120.

Almost surely, 2^20381632 is an apocalyptic number.

It is an amenable number.

20381632 is an abundant number, since it is smaller than the sum of its proper divisors (21371904).

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

20381632 is a wasteful number, since it uses less digits than its factorization.

20381632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10316 (or 10306 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20381632 is about 4514.6020865631. The cubic root of 20381632 is about 273.1574094341.

Adding to 20381632 its reverse (23618302), we get a palindrome (43999934).

The spelling of 20381632 in words is "twenty million, three hundred eighty-one thousand, six hundred thirty-two".