20443603620 has 96 divisors (see below), whose sum is σ = 62695213056. Its totient is φ = 4936240000.

The previous prime is 20443603619. The next prime is 20443603669. The reversal of 20443603620 is 2630634402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 103957 + ... + 227363.

It is an arithmetic number, because the mean of its divisors is an integer number (653075136).

Almost surely, 2^20443603620 is an apocalyptic number.

20443603620 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 20443603620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31347606528).

20443603620 is an abundant number, since it is smaller than the sum of its proper divisors (42251609436).

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

20443603620 is a wasteful number, since it uses less digits than its factorization.

20443603620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123681 (or 123679 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 30.

The spelling of 20443603620 in words is "twenty billion, four hundred forty-three million, six hundred three thousand, six hundred twenty".