20381499 has 6 divisors (see below), whose sum is σ = 29439956. Its totient is φ = 13587660.

The previous prime is 20381489. The next prime is 20381549. The reversal of 20381499 is 99418302.

It is not a de Polignac number, because 20381499 - 2¹¹ = 20379451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20381479) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1132297 + ... + 1132314.

Almost surely, 2^20381499 is an apocalyptic number.

20381499 is a deficient number, since it is larger than the sum of its proper divisors (9058457).

20381499 is a wasteful number, since it uses less digits than its factorization.

20381499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2264617 (or 2264614 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 20381499 is about 4514.5873565587. The cubic root of 20381499 is about 273.1568152714.

The spelling of 20381499 in words is "twenty million, three hundred eighty-one thousand, four hundred ninety-nine".