20919448488 has 16 divisors (see below), whose sum is σ = 52298621280. Its totient is φ = 6973149488.

The previous prime is 20919448477. The next prime is 20919448507. The reversal of 20919448488 is 88484491902.

It is a super-2 number, since 2×20919448488² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435821820 + ... + 435821867.

It is an arithmetic number, because the mean of its divisors is an integer number (3268663830).

Almost surely, 2^20919448488 is an apocalyptic number.

It is an amenable number.

20919448488 is an abundant number, since it is smaller than the sum of its proper divisors (31379172792).

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

20919448488 is a wasteful number, since it uses less digits than its factorization.

20919448488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871643696 (or 871643692 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 57.

The spelling of 20919448488 in words is "twenty billion, nine hundred nineteen million, four hundred forty-eight thousand, four hundred eighty-eight".