20005220 has 24 divisors (see below), whose sum is σ = 42177408. Its totient is φ = 7970400.

The previous prime is 20005213. The next prime is 20005231. The reversal of 20005220 is 2250002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3575 + ... + 7265.

It is an arithmetic number, because the mean of its divisors is an integer number (1757392).

Almost surely, 2^20005220 is an apocalyptic number.

20005220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20005220 is an abundant number, since it is smaller than the sum of its proper divisors (22172188).

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

20005220 is a wasteful number, since it uses less digits than its factorization.

20005220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3971 (or 3969 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 20005220 is about 4472.7195306659. The cubic root of 20005220 is about 271.4653750385.

Adding to 20005220 its reverse (2250002), we get a palindrome (22255222).

The spelling of 20005220 in words is "twenty million, five thousand, two hundred twenty".