20632821 has 8 divisors (see below), whose sum is σ = 30011424. Its totient is φ = 12504720.

The previous prime is 20632811. The next prime is 20632853. The reversal of 20632821 is 12823602.

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

It is not a de Polignac number, because 20632821 - 2⁷ = 20632693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20632791 and 20632800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20632811) 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, 312586 + ... + 312651.

It is an arithmetic number, because the mean of its divisors is an integer number (3751428).

Almost surely, 2^20632821 is an apocalyptic number.

It is an amenable number.

20632821 is a deficient number, since it is larger than the sum of its proper divisors (9378603).

20632821 is a wasteful number, since it uses less digits than its factorization.

20632821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625251.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20632821 is about 4542.3365132936. The cubic root of 20632821 is about 274.2749872184.

It can be divided in two parts, 2063 and 2821, that added together give a palindrome (4884).

The spelling of 20632821 in words is "twenty million, six hundred thirty-two thousand, eight hundred twenty-one".