20662235621520 has 160 divisors (see below), whose sum is σ = 64958947432704. Its totient is φ = 5432001792000.

The previous prime is 20662235621509. The next prime is 20662235621557. The reversal of 20662235621520 is 2512653226602.

It is a happy number.

It is a super-2 number, since 2×20662235621520² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 454962334 + ... + 455007746.

Almost surely, 2^{20662235621520} is an apocalyptic number.

20662235621520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20662235621520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32479473716352).

20662235621520 is an abundant number, since it is smaller than the sum of its proper divisors (44296711811184).

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

20662235621520 is a wasteful number, since it uses less digits than its factorization.

20662235621520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72201 (or 72195 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 20662235621520 in words is "twenty trillion, six hundred sixty-two billion, two hundred thirty-five million, six hundred twenty-one thousand, five hundred twenty".