20380215 has 16 divisors (see below), whose sum is σ = 32692608. Its totient is φ = 10841376.

The previous prime is 20380211. The next prime is 20380219. The reversal of 20380215 is 51208302.

It is an interprime number because it is at equal distance from previous prime (20380211) and next prime (20380219).

It is not a de Polignac number, because 20380215 - 2² = 20380211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20380191 and 20380200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20380211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5112 + ... + 8178.

It is an arithmetic number, because the mean of its divisors is an integer number (2043288).

Almost surely, 2^20380215 is an apocalyptic number.

20380215 is a deficient number, since it is larger than the sum of its proper divisors (12312393).

20380215 is a wasteful number, since it uses less digits than its factorization.

20380215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3518.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20380215 is about 4514.4451486312. The cubic root of 20380215 is about 273.1510790117.

Adding to 20380215 its reverse (51208302), we get a palindrome (71588517).

The spelling of 20380215 in words is "twenty million, three hundred eighty thousand, two hundred fifteen".