20535265 has 16 divisors (see below), whose sum is σ = 25233408. Its totient is φ = 16039296.

The previous prime is 20535253. The next prime is 20535271. The reversal of 20535265 is 56253502.

It is a cyclic number.

It is not a de Polignac number, because 20535265 - 2⁹ = 20534753 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46134 + ... + 46576.

It is an arithmetic number, because the mean of its divisors is an integer number (1577088).

Almost surely, 2^20535265 is an apocalyptic number.

It is an amenable number.

20535265 is a deficient number, since it is larger than the sum of its proper divisors (4698143).

20535265 is a wasteful number, since it uses less digits than its factorization.

20535265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 20535265 is about 4531.5852634591. The cubic root of 20535265 is about 273.8420289265.

Adding to 20535265 its reverse (56253502), we get a palindrome (76788767).

The spelling of 20535265 in words is "twenty million, five hundred thirty-five thousand, two hundred sixty-five".