20397387 has 8 divisors (see below), whose sum is σ = 27286336. Its totient is φ = 13553352.

The previous prime is 20397383. The next prime is 20397409. The reversal of 20397387 is 78379302.

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

It is not a de Polignac number, because 20397387 - 2² = 20397383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20397383) 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, 10153 + ... + 11994.

It is an arithmetic number, because the mean of its divisors is an integer number (3410792).

Almost surely, 2^20397387 is an apocalyptic number.

20397387 is a deficient number, since it is larger than the sum of its proper divisors (6888949).

20397387 is a wasteful number, since it uses less digits than its factorization.

20397387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22457.

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

The square root of 20397387 is about 4516.3466430291. The cubic root of 20397387 is about 273.2277748587.

The spelling of 20397387 in words is "twenty million, three hundred ninety-seven thousand, three hundred eighty-seven".