20983765 has 8 divisors (see below), whose sum is σ = 27469728. Its totient is φ = 15260880.

The previous prime is 20983741. The next prime is 20983769. The reversal of 20983765 is 56738902.

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

It is not a de Polignac number, because 20983765 - 2⁷ = 20983637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20983769) 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, 190707 + ... + 190816.

It is an arithmetic number, because the mean of its divisors is an integer number (3433716).

Almost surely, 2^20983765 is an apocalyptic number.

It is an amenable number.

20983765 is a deficient number, since it is larger than the sum of its proper divisors (6485963).

20983765 is a wasteful number, since it uses less digits than its factorization.

20983765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381539.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20983765 is about 4580.8039687374. The cubic root of 20983765 is about 275.8213022705.

It can be divided in two parts, 209837 and 65, that added together give a palindrome (209902).

The spelling of 20983765 in words is "twenty million, nine hundred eighty-three thousand, seven hundred sixty-five".