20889898440 has 64 divisors (see below), whose sum is σ = 63373881600. Its totient is φ = 5508045312.

The previous prime is 20889898433. The next prime is 20889898457. The reversal of 20889898440 is 4489898802.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 967312 + ... + 988671.

It is an arithmetic number, because the mean of its divisors is an integer number (990216900).

Almost surely, 2^20889898440 is an apocalyptic number.

20889898440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20889898440 is an abundant number, since it is smaller than the sum of its proper divisors (42483983160).

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

20889898440 is a wasteful number, since it uses less digits than its factorization.

20889898440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956086 (or 1956082 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 60.

The spelling of 20889898440 in words is "twenty billion, eight hundred eighty-nine million, eight hundred ninety-eight thousand, four hundred forty".