20015853 has 48 divisors (see below), whose sum is σ = 32711616. Its totient is φ = 10782720.

The previous prime is 20015839. The next prime is 20015893. The reversal of 20015853 is 35851002.

It is not a de Polignac number, because 20015853 - 2¹³ = 20007661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20015893) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 206301 + ... + 206397.

It is an arithmetic number, because the mean of its divisors is an integer number (681492).

Almost surely, 2^20015853 is an apocalyptic number.

It is an amenable number.

20015853 is a deficient number, since it is larger than the sum of its proper divisors (12695763).

20015853 is a wasteful number, since it uses less digits than its factorization.

20015853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 20015853 is about 4473.9080231940. The cubic root of 20015853 is about 271.5134621558.

Adding to 20015853 its reverse (35851002), we get a palindrome (55866855).

The spelling of 20015853 in words is "twenty million, fifteen thousand, eight hundred fifty-three".