20829999 has 8 divisors (see below), whose sum is σ = 28043392. Its totient is φ = 13751640.

The previous prime is 20829989. The next prime is 20830013. The reversal of 20829999 is 99992802.

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

It is not a de Polignac number, because 20829999 - 2⁴ = 20829983 is a prime.

It is a super-5 number, since 5×20829999⁵ (a number of 38 digits) contains 55555 as substring.

It is a Duffinian number.

20829999 is a modest number, since divided by 9999 gives 2082 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20829959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33397 + ... + 34014.

It is an arithmetic number, because the mean of its divisors is an integer number (3505424).

Almost surely, 2^20829999 is an apocalyptic number.

20829999 is a deficient number, since it is larger than the sum of its proper divisors (7213393).

20829999 is a wasteful number, since it uses less digits than its factorization.

20829999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67517.

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 20829999 is about 4563.9893733443. The cubic root of 20829999 is about 275.1459236565.

The spelling of 20829999 in words is "twenty million, eight hundred twenty-nine thousand, nine hundred ninety-nine".