20001551606 has 8 divisors (see below), whose sum is σ = 30034976880. Its totient is φ = 9989892648.

The previous prime is 20001551543. The next prime is 20001551621. The reversal of 20001551606 is 60615510002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5439281 + ... + 5442956.

It is an arithmetic number, because the mean of its divisors is an integer number (3754372110).

Almost surely, 2^20001551606 is an apocalyptic number.

20001551606 is a deficient number, since it is larger than the sum of its proper divisors (10033425274).

20001551606 is a wasteful number, since it uses less digits than its factorization.

20001551606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10883158.

The product of its (nonzero) digits is 1800, while the sum is 26.

The spelling of 20001551606 in words is "twenty billion, one million, five hundred fifty-one thousand, six hundred six".