20350440 has 160 divisors (see below), whose sum is σ = 74748960. Its totient is φ = 4924800.

The previous prime is 20350439. The next prime is 20350471. The reversal of 20350440 is 4405302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 35355 + ... + 35925.

It is an arithmetic number, because the mean of its divisors is an integer number (467181).

Almost surely, 2^20350440 is an apocalyptic number.

20350440 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 20350440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37374480).

20350440 is an abundant number, since it is smaller than the sum of its proper divisors (54398520).

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

20350440 is a wasteful number, since it uses less digits than its factorization.

20350440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20350440 is about 4511.1461958132. The cubic root of 20350440 is about 273.0179918103.

Adding to 20350440 its reverse (4405302), we get a palindrome (24755742).

The spelling of 20350440 in words is "twenty million, three hundred fifty thousand, four hundred forty".