20213115 has 16 divisors (see below), whose sum is σ = 34829088. Its totient is φ = 9950976.

The previous prime is 20213107. The next prime is 20213183. The reversal of 20213115 is 51131202.

It is not a de Polignac number, because 20213115 - 2³ = 20213107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 20213094 and 20213103.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51634 + ... + 52023.

It is an arithmetic number, because the mean of its divisors is an integer number (2176818).

Almost surely, 2^20213115 is an apocalyptic number.

20213115 is a deficient number, since it is larger than the sum of its proper divisors (14615973).

20213115 is a wasteful number, since it uses less digits than its factorization.

20213115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103678.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20213115 is about 4495.8997987055. The cubic root of 20213115 is about 272.4024957670.

Adding to 20213115 its reverse (51131202), we get a palindrome (71344317).

The spelling of 20213115 in words is "twenty million, two hundred thirteen thousand, one hundred fifteen".