20829213 has 12 divisors (see below), whose sum is σ = 30148768. Its totient is φ = 13857480.

The previous prime is 20829209. The next prime is 20829217. The reversal of 20829213 is 31292802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20829209) and next prime (20829217).

It is not a de Polignac number, because 20829213 - 2² = 20829209 is a prime.

It is a super-2 number, since 2×20829213² = 867712228398738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20829217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2808 + ... + 7038.

Almost surely, 2^20829213 is an apocalyptic number.

It is an amenable number.

20829213 is a deficient number, since it is larger than the sum of its proper divisors (9319555).

20829213 is a wasteful number, since it uses less digits than its factorization.

20829213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4784 (or 4781 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20829213 is about 4563.9032636549. The cubic root of 20829213 is about 275.1424628240.

The spelling of 20829213 in words is "twenty million, eight hundred twenty-nine thousand, two hundred thirteen".