20648515 has 8 divisors (see below), whose sum is σ = 24878448. Its totient is φ = 16452000.

The previous prime is 20648501. The next prime is 20648527. The reversal of 20648515 is 51584602.

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

It is not a de Polignac number, because 20648515 - 2¹¹ = 20646467 is a prime.

It is a super-2 number, since 2×20648515² = 852722343410450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6972 + ... + 9481.

It is an arithmetic number, because the mean of its divisors is an integer number (3109806).

Almost surely, 2^20648515 is an apocalyptic number.

20648515 is a deficient number, since it is larger than the sum of its proper divisors (4229933).

20648515 is a wasteful number, since it uses less digits than its factorization.

20648515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16709.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 20648515 is about 4544.0637099407. The cubic root of 20648515 is about 274.3445104429.

The spelling of 20648515 in words is "twenty million, six hundred forty-eight thousand, five hundred fifteen".