20011637644 has 24 divisors (see below), whose sum is σ = 35523290880. Its totient is φ = 9862677264.

The previous prime is 20011637617. The next prime is 20011637647. The reversal of 20011637644 is 44673611002.

It is not an unprimeable number, because it can be changed into a prime (20011637647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77097 + ... + 214399.

It is an arithmetic number, because the mean of its divisors is an integer number (1480137120).

Almost surely, 2^20011637644 is an apocalyptic number.

It is an amenable number.

20011637644 is a deficient number, since it is larger than the sum of its proper divisors (15511653236).

20011637644 is a wasteful number, since it uses less digits than its factorization.

20011637644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137829 (or 137827 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 20011637644 in words is "twenty billion, eleven million, six hundred thirty-seven thousand, six hundred forty-four".