20612355220 has 24 divisors (see below), whose sum is σ = 43353291744. Its totient is φ = 8232114336.

The previous prime is 20612355209. The next prime is 20612355223. The reversal of 20612355220 is 2255321602.

It is a super-2 number, since 2×20612355220² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20612355223) 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, 788554 + ... + 814273.

It is an arithmetic number, because the mean of its divisors is an integer number (1806387156).

Almost surely, 2^20612355220 is an apocalyptic number.

20612355220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20612355220 is an abundant number, since it is smaller than the sum of its proper divisors (22740936524).

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

20612355220 is a wasteful number, since it uses less digits than its factorization.

20612355220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603479 (or 1603477 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 20612355220 its reverse (2255321602), we get a palindrome (22867676822).

The spelling of 20612355220 in words is "twenty billion, six hundred twelve million, three hundred fifty-five thousand, two hundred twenty".