20853801 has 16 divisors (see below), whose sum is σ = 32238720. Its totient is φ = 13297680.

The previous prime is 20853799. The next prime is 20853803. The reversal of 20853801 is 10835802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20853799) and next prime (20853803).

It is not a de Polignac number, because 20853801 - 2¹ = 20853799 is a prime.

It is a super-2 number, since 2×20853801² = 869762032295202, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (20853803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16170 + ... + 17411.

It is an arithmetic number, because the mean of its divisors is an integer number (2014920).

Almost surely, 2^20853801 is an apocalyptic number.

It is an amenable number.

20853801 is a deficient number, since it is larger than the sum of its proper divisors (11384919).

20853801 is a wasteful number, since it uses less digits than its factorization.

20853801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33613 (or 33607 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 20853801 is about 4566.5962160016. The cubic root of 20853801 is about 275.2506849095.

It can be divided in two parts, 2085 and 3801, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 20853801 in words is "twenty million, eight hundred fifty-three thousand, eight hundred one".