20008240 has 40 divisors (see below), whose sum is σ = 53166240. Its totient is φ = 6859776.

The previous prime is 20008223. The next prime is 20008243. The reversal of 20008240 is 4280002.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (20008243) 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, 17305 + ... + 18424.

It is an arithmetic number, because the mean of its divisors is an integer number (1329156).

Almost surely, 2^20008240 is an apocalyptic number.

20008240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20008240 is an abundant number, since it is smaller than the sum of its proper divisors (33158000).

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

20008240 is a wasteful number, since it uses less digits than its factorization.

20008240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35749 (or 35743 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 20008240 is about 4473.0571201361. The cubic root of 20008240 is about 271.4790345431.

Adding to 20008240 its reverse (4280002), we get a palindrome (24288242).

The spelling of 20008240 in words is "twenty million, eight thousand, two hundred forty".