20420515 has 8 divisors (see below), whose sum is σ = 24579360. Its totient is φ = 16286592.

The previous prime is 20420503. The next prime is 20420531. The reversal of 20420515 is 51502402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20420515 - 2¹¹ = 20418467 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20420492 and 20420501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4375 + ... + 7744.

It is an arithmetic number, because the mean of its divisors is an integer number (3072420).

Almost surely, 2^20420515 is an apocalyptic number.

20420515 is a deficient number, since it is larger than the sum of its proper divisors (4158845).

20420515 is a wasteful number, since it uses less digits than its factorization.

20420515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12461.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20420515 is about 4518.9063942507. The cubic root of 20420515 is about 273.3310041774.

Adding to 20420515 its reverse (51502402), we get a palindrome (71922917).

The spelling of 20420515 in words is "twenty million, four hundred twenty thousand, five hundred fifteen".