20227980 has 48 divisors (see below), whose sum is σ = 57716064. Its totient is φ = 5291520.

The previous prime is 20227969. The next prime is 20227997. The reversal of 20227980 is 8972202.

20227980 is a nontrivial binomial coefficient, being equal to C(6361, 2).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1 + ... + 6360.

It is an arithmetic number, because the mean of its divisors is an integer number (1202418).

Almost surely, 2^20227980 is an apocalyptic number.

20227980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

20227980 is the 6360-th triangular number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20227980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28858032).

20227980 is an abundant number, since it is smaller than the sum of its proper divisors (37488084).

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

20227980 is a wasteful number, since it uses less digits than its factorization.

20227980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6426 (or 6424 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20227980 is about 4497.5526678406. The cubic root of 20227980 is about 272.4692555725.

It can be divided in two parts, 202 and 27980, that added together give a palindrome (28182).

The spelling of 20227980 in words is "twenty million, two hundred twenty-seven thousand, nine hundred eighty".