20016001644 has 24 divisors (see below), whose sum is σ = 46714492608. Its totient is φ = 6670502160.

The previous prime is 20016001633. The next prime is 20016001711. The reversal of 20016001644 is 44610061002.

It is a super-2 number, since 2×20016001644² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130962 + ... + 239129.

It is an arithmetic number, because the mean of its divisors is an integer number (1946437192).

Almost surely, 2^20016001644 is an apocalyptic number.

It is an amenable number.

20016001644 is an abundant number, since it is smaller than the sum of its proper divisors (26698490964).

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

20016001644 is a wasteful number, since it uses less digits than its factorization.

20016001644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374605 (or 374603 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 20016001644 its reverse (44610061002), we get a palindrome (64626062646).

The spelling of 20016001644 in words is "twenty billion, sixteen million, one thousand, six hundred forty-four".