20421466535220 has 48 divisors (see below), whose sum is σ = 57180426182208. Its totient is φ = 5445693944320.

The previous prime is 20421466535209. The next prime is 20421466535227. The reversal of 20421466535220 is 2253566412402.

It is a super-2 number, since 2×20421466535220² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421466535227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11129635 + ... + 12834005.

It is an arithmetic number, because the mean of its divisors is an integer number (1191258878796).

Almost surely, 2^{20421466535220} is an apocalyptic number.

20421466535220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20421466535220 is an abundant number, since it is smaller than the sum of its proper divisors (36758959646988).

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

20421466535220 is a wasteful number, since it uses less digits than its factorization.

20421466535220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904080 (or 1904078 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 42.

The spelling of 20421466535220 in words is "twenty trillion, four hundred twenty-one billion, four hundred sixty-six million, five hundred thirty-five thousand, two hundred twenty".