20615465 has 24 divisors (see below), whose sum is σ = 27687168. Its totient is φ = 14713920.

The previous prime is 20615453. The next prime is 20615467. The reversal of 20615465 is 56451602.

It is not a de Polignac number, because 20615465 - 2¹² = 20611369 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20615467) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 25802 + ... + 26588.

It is an arithmetic number, because the mean of its divisors is an integer number (1153632).

Almost surely, 2^20615465 is an apocalyptic number.

It is an amenable number.

20615465 is a deficient number, since it is larger than the sum of its proper divisors (7071703).

20615465 is a wasteful number, since it uses less digits than its factorization.

20615465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849 (or 836 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 20615465 is about 4540.4256408403. The cubic root of 20615465 is about 274.1980603960.

The spelling of 20615465 in words is "twenty million, six hundred fifteen thousand, four hundred sixty-five".