20660415 has 32 divisors (see below), whose sum is σ = 34461696. Its totient is φ = 10558080.

The previous prime is 20660399. The next prime is 20660473. The reversal of 20660415 is 51406602.

It is not a de Polignac number, because 20660415 - 2⁴ = 20660399 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72864 + ... + 73146.

It is an arithmetic number, because the mean of its divisors is an integer number (1076928).

Almost surely, 2^20660415 is an apocalyptic number.

20660415 is a deficient number, since it is larger than the sum of its proper divisors (13801281).

20660415 is a wasteful number, since it uses less digits than its factorization.

20660415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20660415 is about 4545.3729219944. The cubic root of 20660415 is about 274.3972030572.

The spelling of 20660415 in words is "twenty million, six hundred sixty thousand, four hundred fifteen".