20521606562220 has 48 divisors (see below), whose sum is σ = 57841031501568. Its totient is φ = 5436187166400.

The previous prime is 20521606562207. The next prime is 20521606562227. The reversal of 20521606562220 is 2226560612502.

It is a super-2 number, since 2×20521606562220² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20521606562227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1132529934 + ... + 1132548053.

It is an arithmetic number, because the mean of its divisors is an integer number (1205021489616).

Almost surely, 2^{20521606562220} is an apocalyptic number.

20521606562220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20521606562220 is an abundant number, since it is smaller than the sum of its proper divisors (37319424939348).

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

20521606562220 is a wasteful number, since it uses less digits than its factorization.

20521606562220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2265078150 (or 2265078148 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 20521606562220 in words is "twenty trillion, five hundred twenty-one billion, six hundred six million, five hundred sixty-two thousand, two hundred twenty".