20670829 has 4 divisors (see below), whose sum is σ = 20819680. Its totient is φ = 20521980.

The previous prime is 20670817. The next prime is 20670851. The reversal of 20670829 is 92807602.

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, and also an emirpimes, since its reverse is a distinct semiprime: 92807602 = 2 ⋅46403801.

It is a cyclic number.

It is not a de Polignac number, because 20670829 - 2⁷ = 20670701 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20670794 and 20670803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20670889) 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, 74217 + ... + 74494.

It is an arithmetic number, because the mean of its divisors is an integer number (5204920).

Almost surely, 2^20670829 is an apocalyptic number.

It is an amenable number.

20670829 is a deficient number, since it is larger than the sum of its proper divisors (148851).

20670829 is a wasteful number, since it uses less digits than its factorization.

20670829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148850.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20670829 is about 4546.5183382452. The cubic root of 20670829 is about 274.4432991381.

The spelling of 20670829 in words is "twenty million, six hundred seventy thousand, eight hundred twenty-nine".