20220040 has 16 divisors (see below), whose sum is σ = 45495180. Its totient is φ = 8088000.

The previous prime is 20220023. The next prime is 20220041. The reversal of 20220040 is 4002202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19838116 + 381924 = 4454^2 + 618^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20219999 and 20220026.

It is not an unprimeable number, because it can be changed into a prime (20220041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252711 + ... + 252790.

Almost surely, 2^20220040 is an apocalyptic number.

20220040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20220040 is an abundant number, since it is smaller than the sum of its proper divisors (25275140).

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

20220040 is a wasteful number, since it uses less digits than its factorization.

20220040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505512 (or 505508 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 20220040 is about 4496.6698789215. The cubic root of 20220040 is about 272.4336005208.

Adding to 20220040 its reverse (4002202), we get a palindrome (24222242).

The spelling of 20220040 in words is "twenty million, two hundred twenty thousand, forty".