20741637644 has 96 divisors (see below), whose sum is σ = 47517474816. Its totient is φ = 7687664640.

The previous prime is 20741637601. The next prime is 20741637647. The reversal of 20741637644 is 44673614702.

It is a junction number, because it is equal to n+sod(n) for n = 20741637595 and 20741637604.

It is not an unprimeable number, because it can be changed into a prime (20741637647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1372409 + ... + 1387439.

It is an arithmetic number, because the mean of its divisors is an integer number (494973696).

Almost surely, 2^20741637644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20741637644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23758737408).

20741637644 is an abundant number, since it is smaller than the sum of its proper divisors (26775837172).

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

20741637644 is a wasteful number, since it uses less digits than its factorization.

20741637644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15295 (or 15293 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 44.

The spelling of 20741637644 in words is "twenty billion, seven hundred forty-one million, six hundred thirty-seven thousand, six hundred forty-four".