20860535 has 16 divisors (see below), whose sum is σ = 25691904. Its totient is φ = 16253952.

The previous prime is 20860523. The next prime is 20860549. The reversal of 20860535 is 53506802.

20860535 = 188² + 189² + ... + 410².

It is a cyclic number.

It is not a de Polignac number, because 20860535 - 2¹² = 20856439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20860498 and 20860507.

It is a congruent 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, 58919 + ... + 59271.

It is an arithmetic number, because the mean of its divisors is an integer number (1605744).

Almost surely, 2^20860535 is an apocalyptic number.

20860535 is a deficient number, since it is larger than the sum of its proper divisors (4831369).

20860535 is a wasteful number, since it uses less digits than its factorization.

20860535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634.

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

The square root of 20860535 is about 4567.3334671337. Note that the first 3 decimals coincide. The cubic root of 20860535 is about 275.2803092233.

The spelling of 20860535 in words is "twenty million, eight hundred sixty thousand, five hundred thirty-five".