20406315 has 16 divisors (see below), whose sum is σ = 33447456. Its totient is φ = 10617600.

The previous prime is 20406311. The next prime is 20406329. The reversal of 20406315 is 51360402.

It is a happy number.

It is not a de Polignac number, because 20406315 - 2² = 20406311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20406291 and 20406300.

It is not an unprimeable number, because it can be changed into a prime (20406311) 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, 15976 + ... + 17205.

It is an arithmetic number, because the mean of its divisors is an integer number (2090466).

Almost surely, 2^20406315 is an apocalyptic number.

20406315 is a deficient number, since it is larger than the sum of its proper divisors (13041141).

20406315 is a wasteful number, since it uses less digits than its factorization.

20406315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33230.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20406315 is about 4517.3349444114. The cubic root of 20406315 is about 273.2676332607.

Adding to 20406315 its reverse (51360402), we get a palindrome (71766717).

The spelling of 20406315 in words is "twenty million, four hundred six thousand, three hundred fifteen".