20061628387640 has 64 divisors (see below), whose sum is σ = 51597505517760. Its totient is φ = 6876877777920.

The previous prime is 20061628387631. The next prime is 20061628387657. The reversal of 20061628387640 is 4678382616002.

It is a happy number.

It is a super-2 number, since 2×20061628387640² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5880941 + ... + 8643420.

It is an arithmetic number, because the mean of its divisors is an integer number (806211023715).

Almost surely, 2^{20061628387640} is an apocalyptic number.

20061628387640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20061628387640 is an abundant number, since it is smaller than the sum of its proper divisors (31535877130120).

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

20061628387640 is a wasteful number, since it uses less digits than its factorization.

20061628387640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14529312 (or 14529308 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 53.

The spelling of 20061628387640 in words is "twenty trillion, sixty-one billion, six hundred twenty-eight million, three hundred eighty-seven thousand, six hundred forty".