20843025 has 72 divisors (see below), whose sum is σ = 41872320. Its totient is φ = 8951040.

The previous prime is 20843023. The next prime is 20843051. The reversal of 20843025 is 52034802.

It is not a de Polignac number, because 20843025 - 2¹ = 20843023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20842986 and 20843004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20843021) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 563307 + ... + 563343.

It is an arithmetic number, because the mean of its divisors is an integer number (581560).

Almost surely, 2^20843025 is an apocalyptic number.

20843025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20843025 is an abundant number, since it is smaller than the sum of its proper divisors (21029295).

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

20843025 is a wasteful number, since it uses less digits than its factorization.

20843025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20843025 is about 4565.4161913236. The cubic root of 20843025 is about 275.2032656975.

Adding to 20843025 its reverse (52034802), we get a palindrome (72877827).

The spelling of 20843025 in words is "twenty million, eight hundred forty-three thousand, twenty-five".