20853531 has 12 divisors (see below), whose sum is σ = 31237752. Its totient is φ = 13902192.

The previous prime is 20853529. The next prime is 20853541. The reversal of 20853531 is 13535802.

It is not a de Polignac number, because 20853531 - 2¹ = 20853529 is a prime.

It is a super-2 number, since 2×20853531² = 869739510335922, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 20853495 and 20853504.

It is not an unprimeable number, because it can be changed into a prime (20853541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42666 + ... + 43151.

It is an arithmetic number, because the mean of its divisors is an integer number (2603146).

Almost surely, 2^20853531 is an apocalyptic number.

20853531 is a deficient number, since it is larger than the sum of its proper divisors (10384221).

20853531 is an frugal number, since it uses more digits than its factorization.

20853531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85832 (or 85820 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 20853531 is about 4566.5666534060. The cubic root of 20853531 is about 275.2494969884.

The spelling of 20853531 in words is "twenty million, eight hundred fifty-three thousand, five hundred thirty-one".