20852481 has 32 divisors (see below), whose sum is σ = 31933440. Its totient is φ = 11997504.

The previous prime is 20852473. The next prime is 20852501. The reversal of 20852481 is 18425802.

It is not a de Polignac number, because 20852481 - 2³ = 20852473 is a prime.

It is a super-2 number, since 2×20852481² = 869651927710722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20852411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79156 + ... + 79418.

It is an arithmetic number, because the mean of its divisors is an integer number (997920).

Almost surely, 2^20852481 is an apocalyptic number.

It is an amenable number.

20852481 is a deficient number, since it is larger than the sum of its proper divisors (11080959).

20852481 is a wasteful number, since it uses less digits than its factorization.

20852481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 20852481 is about 4566.4516859373. The cubic root of 20852481 is about 275.2448771981.

The spelling of 20852481 in words is "twenty million, eight hundred fifty-two thousand, four hundred eighty-one".