20204040 has 64 divisors (see below), whose sum is σ = 61248960. Its totient is φ = 5331200.

The previous prime is 20204029. The next prime is 20204047. The reversal of 20204040 is 4040202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is not an unprimeable number, because it can be changed into a prime (20204047) 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, 11287 + ... + 12953.

It is an arithmetic number, because the mean of its divisors is an integer number (957015).

Almost surely, 2^20204040 is an apocalyptic number.

20204040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20204040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30624480).

20204040 is an abundant number, since it is smaller than the sum of its proper divisors (41044920).

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

20204040 is a wasteful number, since it uses less digits than its factorization.

20204040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782 (or 1778 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 20204040 is about 4494.8904324800. The cubic root of 20204040 is about 272.3617231845.

Adding to 20204040 its reverse (4040202), we get a palindrome (24244242).

The spelling of 20204040 in words is "twenty million, two hundred four thousand, forty".