20853020 has 24 divisors (see below), whose sum is σ = 44183664. Its totient is φ = 8266496.

The previous prime is 20852981. The next prime is 20853023. The reversal of 20853020 is 2035802.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20852983 and 20853001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20853023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2354 + ... + 6873.

It is an arithmetic number, because the mean of its divisors is an integer number (1840986).

Almost surely, 2^20853020 is an apocalyptic number.

20853020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20853020 is an abundant number, since it is smaller than the sum of its proper divisors (23330644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20853020 is a wasteful number, since it uses less digits than its factorization.

20853020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9349 (or 9347 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20853020 is about 4566.5107029328. The cubic root of 20853020 is about 275.2472487099.

Adding to 20853020 its reverse (2035802), we get a palindrome (22888822).

The spelling of 20853020 in words is "twenty million, eight hundred fifty-three thousand, twenty".