20013983 has 8 divisors (see below), whose sum is σ = 21939456. Its totient is φ = 18106200.

The previous prime is 20013971. The next prime is 20013991. The reversal of 20013983 is 38931002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20013983 - 2¹² = 20009887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013083) 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, 1991 + ... + 6632.

It is an arithmetic number, because the mean of its divisors is an integer number (2742432).

Almost surely, 2^20013983 is an apocalyptic number.

20013983 is a deficient number, since it is larger than the sum of its proper divisors (1925473).

20013983 is a wasteful number, since it uses less digits than its factorization.

20013983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8845.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 20013983 is about 4473.6990287680. The cubic root of 20013983 is about 271.5050064251.

Adding to 20013983 its reverse (38931002), we get a palindrome (58944985).

The spelling of 20013983 in words is "twenty million, thirteen thousand, nine hundred eighty-three".