20510452220 has 12 divisors (see below), whose sum is σ = 43071949704. Its totient is φ = 8204180880.

The previous prime is 20510452219. The next prime is 20510452267. The reversal of 20510452220 is 2225401502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512761286 + ... + 512761325.

It is an arithmetic number, because the mean of its divisors is an integer number (3589329142).

Almost surely, 2^20510452220 is an apocalyptic number.

20510452220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20510452220 is an abundant number, since it is smaller than the sum of its proper divisors (22561497484).

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

20510452220 is a wasteful number, since it uses less digits than its factorization.

20510452220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025522620 (or 1025522618 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

Adding to 20510452220 its reverse (2225401502), we get a palindrome (22735853722).

The spelling of 20510452220 in words is "twenty billion, five hundred ten million, four hundred fifty-two thousand, two hundred twenty".