20829980 has 24 divisors (see below), whose sum is σ = 44362080. Its totient is φ = 8214080.

The previous prime is 20829979. The next prime is 20829983. The reversal of 20829980 is 8992802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20829983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5915 + ... + 8754.

It is an arithmetic number, because the mean of its divisors is an integer number (1848420).

Almost surely, 2^20829980 is an apocalyptic number.

20829980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20829980 is an abundant number, since it is smaller than the sum of its proper divisors (23532100).

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

20829980 is a wasteful number, since it uses less digits than its factorization.

20829980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14749 (or 14747 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 20829980 is about 4563.9872918316. The cubic root of 20829980 is about 275.1458399988.

The spelling of 20829980 in words is "twenty million, eight hundred twenty-nine thousand, nine hundred eighty".