20632143 has 32 divisors (see below), whose sum is σ = 33288192. Its totient is φ = 11116800.

The previous prime is 20632111. The next prime is 20632147. The reversal of 20632143 is 34123602.

20632143 = 112² + 113² + ... + 398².

It is a happy number.

It is not a de Polignac number, because 20632143 - 2⁵ = 20632111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20632147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26305 + ... + 27077.

It is an arithmetic number, because the mean of its divisors is an integer number (1040256).

Almost surely, 2^20632143 is an apocalyptic number.

20632143 is a deficient number, since it is larger than the sum of its proper divisors (12656049).

20632143 is a wasteful number, since it uses less digits than its factorization.

20632143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20632143 is about 4542.2618814859. The cubic root of 20632143 is about 274.2719829358.

Adding to 20632143 its reverse (34123602), we get a palindrome (54755745).

The spelling of 20632143 in words is "twenty million, six hundred thirty-two thousand, one hundred forty-three".