20830381 has 16 divisors (see below), whose sum is σ = 25320960. Its totient is φ = 16873920.

The previous prime is 20830379. The next prime is 20830391. The reversal of 20830381 is 18303802.

It is a cyclic number.

It is not a de Polignac number, because 20830381 - 2¹ = 20830379 is a prime.

It is a super-2 number, since 2×20830381² = 867809545210322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20830301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1636 + ... + 6658.

It is an arithmetic number, because the mean of its divisors is an integer number (1582560).

Almost surely, 2^20830381 is an apocalyptic number.

It is an amenable number.

20830381 is a deficient number, since it is larger than the sum of its proper divisors (4490579).

20830381 is a wasteful number, since it uses less digits than its factorization.

20830381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5076.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20830381 is about 4564.0312225049. The cubic root of 20830381 is about 275.1476056073.

The spelling of 20830381 in words is "twenty million, eight hundred thirty thousand, three hundred eighty-one".