20783121 has 8 divisors (see below), whose sum is σ = 27734784. Its totient is φ = 13843440.

The previous prime is 20783089. The next prime is 20783137. The reversal of 20783121 is 12138702.

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

It is not a de Polignac number, because 20783121 - 2⁵ = 20783089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20783091 and 20783100.

It is not an unprimeable number, because it can be changed into a prime (20783221) 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, 2491 + ... + 6911.

It is an arithmetic number, because the mean of its divisors is an integer number (3466848).

Almost surely, 2^20783121 is an apocalyptic number.

It is an amenable number.

20783121 is a deficient number, since it is larger than the sum of its proper divisors (6951663).

20783121 is a wasteful number, since it uses less digits than its factorization.

20783121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5991.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 20783121 is about 4558.8508420434. The cubic root of 20783121 is about 274.9393629391.

The spelling of 20783121 in words is "twenty million, seven hundred eighty-three thousand, one hundred twenty-one".