20983495 has 16 divisors (see below), whose sum is σ = 27633312. Its totient is φ = 15200640.

The previous prime is 20983493. The next prime is 20983507. The reversal of 20983495 is 59438902.

It is a happy number.

It is not a de Polignac number, because 20983495 - 2¹ = 20983493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20983493) 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, 400 + ... + 6490.

It is an arithmetic number, because the mean of its divisors is an integer number (1727082).

Almost surely, 2^20983495 is an apocalyptic number.

20983495 is a deficient number, since it is larger than the sum of its proper divisors (6649817).

20983495 is a wasteful number, since it uses less digits than its factorization.

20983495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6162.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 20983495 is about 4580.7744978333. The cubic root of 20983495 is about 275.8201192596.

The spelling of 20983495 in words is "twenty million, nine hundred eighty-three thousand, four hundred ninety-five".