20909574420 has 96 divisors (see below), whose sum is σ = 68542661376. Its totient is φ = 4662758400.

The previous prime is 20909574409. The next prime is 20909574443. The reversal of 20909574420 is 2447590902.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 589911 + ... + 624350.

It is an arithmetic number, because the mean of its divisors is an integer number (713986056).

Almost surely, 2^20909574420 is an apocalyptic number.

20909574420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20909574420 is an abundant number, since it is smaller than the sum of its proper divisors (47633086956).

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

20909574420 is a wasteful number, since it uses less digits than its factorization.

20909574420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214321 (or 1214319 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 20909574420 in words is "twenty billion, nine hundred nine million, five hundred seventy-four thousand, four hundred twenty".