20823629 has 4 divisors (see below), whose sum is σ = 20982720. Its totient is φ = 20664540.

The previous prime is 20823619. The next prime is 20823643. The reversal of 20823629 is 92632802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20823629 - 2²⁰ = 19775053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20823595 and 20823604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20823619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79349 + ... + 79610.

It is an arithmetic number, because the mean of its divisors is an integer number (5245680).

Almost surely, 2^20823629 is an apocalyptic number.

It is an amenable number.

20823629 is a deficient number, since it is larger than the sum of its proper divisors (159091).

20823629 is a wasteful number, since it uses less digits than its factorization.

20823629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159090.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 20823629 is about 4563.2914655981. The cubic root of 20823629 is about 275.1178734356.

The spelling of 20823629 in words is "twenty million, eight hundred twenty-three thousand, six hundred twenty-nine".