20001505644645 has 32 divisors (see below), whose sum is σ = 37037146091520. Its totient is φ = 9027804352320.

The previous prime is 20001505644613. The next prime is 20001505644667. The reversal of 20001505644645 is 54644650510002.

It is not a de Polignac number, because 20001505644645 - 2⁵ = 20001505644613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001505644597 and 20001505644606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1205627971 + ... + 1205644560.

It is an arithmetic number, because the mean of its divisors is an integer number (1157410815360).

Almost surely, 2^{20001505644645} is an apocalyptic number.

It is an amenable number.

20001505644645 is a deficient number, since it is larger than the sum of its proper divisors (17035640446875).

20001505644645 is a wasteful number, since it uses less digits than its factorization.

20001505644645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411272625.

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 20001505644645 in words is "twenty trillion, one billion, five hundred five million, six hundred forty-four thousand, six hundred forty-five".