20660265 has 40 divisors (see below), whose sum is σ = 37403520. Its totient is φ = 10909728.

The previous prime is 20660261. The next prime is 20660303. The reversal of 20660265 is 56206602.

It is not a de Polignac number, because 20660265 - 2² = 20660261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20660261) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 56112 + ... + 56478.

It is an arithmetic number, because the mean of its divisors is an integer number (935088).

Almost surely, 2^20660265 is an apocalyptic number.

It is an amenable number.

20660265 is a deficient number, since it is larger than the sum of its proper divisors (16743255).

20660265 is a wasteful number, since it uses less digits than its factorization.

20660265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20660265 is about 4545.3564216682. The cubic root of 20660265 is about 274.3965389905.

Adding to 20660265 its reverse (56206602), we get a palindrome (76866867).

The spelling of 20660265 in words is "twenty million, six hundred sixty thousand, two hundred sixty-five".