20043645780 has 48 divisors (see below), whose sum is σ = 58562308224. Its totient is φ = 5112581760.

The previous prime is 20043645733. The next prime is 20043645781. The reversal of 20043645780 is 8754634002.

It is a happy number.

It is a super-2 number, since 2×20043645780² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20043645781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7260811 + ... + 7263570.

It is an arithmetic number, because the mean of its divisors is an integer number (1220048088).

Almost surely, 2^20043645780 is an apocalyptic number.

20043645780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20043645780 is an abundant number, since it is smaller than the sum of its proper divisors (38518662444).

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

20043645780 is a wasteful number, since it uses less digits than its factorization.

20043645780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14524416 (or 14524414 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 20043645780 in words is "twenty billion, forty-three million, six hundred forty-five thousand, seven hundred eighty".