20661122424 has 64 divisors (see below), whose sum is σ = 54389980800. Its totient is φ = 6522332544.

The previous prime is 20661122371. The next prime is 20661122441. The reversal of 20661122424 is 42422116602.

It is a junction number, because it is equal to n+sod(n) for n = 20661122391 and 20661122400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1775794 + ... + 1787390.

It is an arithmetic number, because the mean of its divisors is an integer number (849843450).

Almost surely, 2^20661122424 is an apocalyptic number.

20661122424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20661122424 is an abundant number, since it is smaller than the sum of its proper divisors (33728858376).

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

20661122424 is a wasteful number, since it uses less digits than its factorization.

20661122424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15532 (or 15528 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The spelling of 20661122424 in words is "twenty billion, six hundred sixty-one million, one hundred twenty-two thousand, four hundred twenty-four".