20369987 has 6 divisors (see below), whose sum is σ = 22390284. Its totient is φ = 18518060.

The previous prime is 20369981. The next prime is 20370011. The reversal of 20369987 is 78996302.

It is not a de Polignac number, because 20369987 - 2¹⁴ = 20353603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20369981) 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, 84053 + ... + 84294.

It is an arithmetic number, because the mean of its divisors is an integer number (3731714).

Almost surely, 2^20369987 is an apocalyptic number.

20369987 is a deficient number, since it is larger than the sum of its proper divisors (2020297).

20369987 is a wasteful number, since it uses less digits than its factorization.

20369987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168369 (or 168358 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 20369987 is about 4513.3121983749. The cubic root of 20369987 is about 273.1053768977.

The spelling of 20369987 in words is "twenty million, three hundred sixty-nine thousand, nine hundred eighty-seven".