20535980 has 12 divisors (see below), whose sum is σ = 43125600. Its totient is φ = 8214384.

The previous prime is 20535947. The next prime is 20536013. The reversal of 20535980 is 8953502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20535947) and next prime (20536013).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513380 + ... + 513419.

It is an arithmetic number, because the mean of its divisors is an integer number (3593800).

Almost surely, 2^20535980 is an apocalyptic number.

20535980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20535980 is an abundant number, since it is smaller than the sum of its proper divisors (22589620).

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

20535980 is a wasteful number, since it uses less digits than its factorization.

20535980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026808 (or 1026806 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 20535980 is about 4531.6641534871. The cubic root of 20535980 is about 273.8452071141.

The spelling of 20535980 in words is "twenty million, five hundred thirty-five thousand, nine hundred eighty".