20983506 has 16 divisors (see below), whose sum is σ = 42499200. Its totient is φ = 6905808.

The previous prime is 20983493. The next prime is 20983507. The reversal of 20983506 is 60538902.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20983507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21661 + ... + 22608.

It is an arithmetic number, because the mean of its divisors is an integer number (2656200).

Almost surely, 2^20983506 is an apocalyptic number.

20983506 is an abundant number, since it is smaller than the sum of its proper divisors (21515694).

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

20983506 is a wasteful number, since it uses less digits than its factorization.

20983506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44353.

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

The square root of 20983506 is about 4580.7756985035. The cubic root of 20983506 is about 275.8201674565.

The spelling of 20983506 in words is "twenty million, nine hundred eighty-three thousand, five hundred six".