20632391 has 8 divisors (see below), whose sum is σ = 22936704. Its totient is φ = 18430560.

The previous prime is 20632363. The next prime is 20632397. The reversal of 20632391 is 19323602.

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

It is a cyclic number.

It is not a de Polignac number, because 20632391 - 2⁶ = 20632327 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20632391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20632397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25196 + ... + 26001.

It is an arithmetic number, because the mean of its divisors is an integer number (2867088).

Almost surely, 2^20632391 is an apocalyptic number.

20632391 is a deficient number, since it is larger than the sum of its proper divisors (2304313).

20632391 is a wasteful number, since it uses less digits than its factorization.

20632391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51241.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 20632391 is about 4542.2891805784. The cubic root of 20632391 is about 274.2730818551.

Adding to 20632391 its reverse (19323602), we get a palindrome (39955993).

The spelling of 20632391 in words is "twenty million, six hundred thirty-two thousand, three hundred ninety-one".