20829393 has 40 divisors (see below), whose sum is σ = 33988416. Its totient is φ = 12636000.

The previous prime is 20829349. The next prime is 20829433. The reversal of 20829393 is 39392802.

It is not a de Polignac number, because 20829393 - 2¹² = 20825297 is a prime.

It is a super-2 number, since 2×20829393² = 867727225496898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20829313) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 137868 + ... + 138018.

Almost surely, 2^20829393 is an apocalyptic number.

It is an amenable number.

20829393 is a deficient number, since it is larger than the sum of its proper divisors (13159023).

20829393 is a wasteful number, since it uses less digits than its factorization.

20829393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 20829393 is about 4563.9229835745. The cubic root of 20829393 is about 275.1432553887.

The spelling of 20829393 in words is "twenty million, eight hundred twenty-nine thousand, three hundred ninety-three".