20284980 has 48 divisors (see below), whose sum is σ = 57081024. Its totient is φ = 5382400.

The previous prime is 20284973. The next prime is 20284981. The reversal of 20284980 is 8948202.

It is a super-2 number, since 2×20284980² = 822960827200800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20284981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13255 + ... + 14705.

It is an arithmetic number, because the mean of its divisors is an integer number (1189188).

Almost surely, 2^20284980 is an apocalyptic number.

20284980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20284980 is an abundant number, since it is smaller than the sum of its proper divisors (36796044).

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

20284980 is a wasteful number, since it uses less digits than its factorization.

20284980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696 (or 1694 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 20284980 is about 4503.8849896506. The cubic root of 20284980 is about 272.7249440205.

The spelling of 20284980 in words is "twenty million, two hundred eighty-four thousand, nine hundred eighty".