20387397 has 8 divisors (see below), whose sum is σ = 27222400. Its totient is φ = 13572000.

The previous prime is 20387387. The next prime is 20387401. The reversal of 20387397 is 79378302.

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

It is not a de Polignac number, because 20387397 - 2¹¹ = 20385349 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 (20387357) 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, 2272 + ... + 6777.

It is an arithmetic number, because the mean of its divisors is an integer number (3402800).

Almost surely, 2^20387397 is an apocalyptic number.

It is an amenable number.

20387397 is a deficient number, since it is larger than the sum of its proper divisors (6835003).

20387397 is an equidigital number, since it uses as much as digits as its factorization.

20387397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9803.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 20387397 is about 4515.2405251548. The cubic root of 20387397 is about 273.1831614448.

The spelling of 20387397 in words is "twenty million, three hundred eighty-seven thousand, three hundred ninety-seven".