20420315 has 16 divisors (see below), whose sum is σ = 26282880. Its totient is φ = 15175680.

The previous prime is 20420311. The next prime is 20420329. The reversal of 20420315 is 51302402.

It is not a de Polignac number, because 20420315 - 2² = 20420311 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 20420293 and 20420302.

It is not an unprimeable number, because it can be changed into a prime (20420311) 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, 5195 + ... + 8235.

It is an arithmetic number, because the mean of its divisors is an integer number (1642680).

Almost surely, 2^20420315 is an apocalyptic number.

20420315 is a deficient number, since it is larger than the sum of its proper divisors (5862565).

20420315 is a wasteful number, since it uses less digits than its factorization.

20420315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3142.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20420315 is about 4518.8842649486. The cubic root of 20420315 is about 273.3301118333.

Adding to 20420315 its reverse (51302402), we get a palindrome (71722717).

The spelling of 20420315 in words is "twenty million, four hundred twenty thousand, three hundred fifteen".