20820360 has 64 divisors (see below), whose sum is σ = 68143680. Its totient is φ = 5047040.

The previous prime is 20820329. The next prime is 20820367. The reversal of 20820360 is 6302802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20820367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6567 + ... + 9206.

It is an arithmetic number, because the mean of its divisors is an integer number (1064745).

Almost surely, 2^20820360 is an apocalyptic number.

20820360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20820360 is an abundant number, since it is smaller than the sum of its proper divisors (47323320).

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

20820360 is a wasteful number, since it uses less digits than its factorization.

20820360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15798 (or 15794 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20820360 is about 4562.9332670991. The cubic root of 20820360 is about 275.1034762109.

The spelling of 20820360 in words is "twenty million, eight hundred twenty thousand, three hundred sixty".