20731383 has 20 divisors (see below), whose sum is σ = 31141528. Its totient is φ = 13744080.

The previous prime is 20731351. The next prime is 20731391. The reversal of 20731383 is 38313702.

It is not a de Polignac number, because 20731383 - 2⁵ = 20731351 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731283) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16485 + ... + 17697.

Almost surely, 2^20731383 is an apocalyptic number.

20731383 is a deficient number, since it is larger than the sum of its proper divisors (10410145).

20731383 is a wasteful number, since it uses less digits than its factorization.

20731383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436 (or 1427 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20731383 is about 4553.1728497829. The cubic root of 20731383 is about 274.7110264768.

The spelling of 20731383 in words is "twenty million, seven hundred thirty-one thousand, three hundred eighty-three".