20387407 has 8 divisors (see below), whose sum is σ = 21849696. Its totient is φ = 18973152.

The previous prime is 20387401. The next prime is 20387431. The reversal of 20387407 is 70478302.

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

It is a cyclic number.

It is not a de Polignac number, because 20387407 - 2¹¹ = 20385359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20387401) 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, 11128 + ... + 12829.

It is an arithmetic number, because the mean of its divisors is an integer number (2731212).

Almost surely, 2^20387407 is an apocalyptic number.

20387407 is a deficient number, since it is larger than the sum of its proper divisors (1462289).

20387407 is a wasteful number, since it uses less digits than its factorization.

20387407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24017.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 20387407 is about 4515.2416325154. The cubic root of 20387407 is about 273.1832061101.

The spelling of 20387407 in words is "twenty million, three hundred eighty-seven thousand, four hundred seven".