20356980 has 96 divisors (see below), whose sum is σ = 68597760. Its totient is φ = 4406400.

The previous prime is 20356979. The next prime is 20356991. The reversal of 20356980 is 8965302.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6705 + ... + 9255.

It is an arithmetic number, because the mean of its divisors is an integer number (714560).

Almost surely, 2^20356980 is an apocalyptic number.

20356980 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 20356980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34298880).

20356980 is an abundant number, since it is smaller than the sum of its proper divisors (48240780).

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

20356980 is a wasteful number, since it uses less digits than its factorization.

20356980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589 (or 2587 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20356980 is about 4511.8710087945. The cubic root of 20356980 is about 273.0472351817.

The spelling of 20356980 in words is "twenty million, three hundred fifty-six thousand, nine hundred eighty".