20829560 has 32 divisors (see below), whose sum is σ = 47401200. Its totient is φ = 8236800.

The previous prime is 20829541. The next prime is 20829577. The reversal of 20829560 is 6592802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 635 + ... + 6485.

Almost surely, 2^20829560 is an apocalyptic number.

20829560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20829560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23700600).

20829560 is an abundant number, since it is smaller than the sum of its proper divisors (26571640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20829560 is a wasteful number, since it uses less digits than its factorization.

20829560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5951 (or 5947 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20829560 is about 4563.9412792016. The cubic root of 20829560 is about 275.1439907086.

The spelling of 20829560 in words is "twenty million, eight hundred twenty-nine thousand, five hundred sixty".