20315384 has 8 divisors (see below), whose sum is σ = 38091360. Its totient is φ = 10157688.

The previous prime is 20315369. The next prime is 20315387. The reversal of 20315384 is 48351302.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1269704 + ... + 1269719.

It is an arithmetic number, because the mean of its divisors is an integer number (4761420).

Almost surely, 2^20315384 is an apocalyptic number.

It is an amenable number.

20315384 is a deficient number, since it is larger than the sum of its proper divisors (17775976).

20315384 is a wasteful number, since it uses less digits than its factorization.

20315384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2539429 (or 2539425 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20315384 is about 4507.2590340472. The cubic root of 20315384 is about 272.8611332909.

Adding to 20315384 its reverse (48351302), we get a palindrome (68666686).

The spelling of 20315384 in words is "twenty million, three hundred fifteen thousand, three hundred eighty-four".