20610705656505 has 32 divisors (see below), whose sum is σ = 33087780460800. Its totient is φ = 10955502414080.

The previous prime is 20610705656501. The next prime is 20610705656551. The reversal of 20610705656505 is 50565650701602.

It is a happy number.

It is not a de Polignac number, because 20610705656505 - 2² = 20610705656501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20610705656501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33530671 + ... + 34139819.

It is an arithmetic number, because the mean of its divisors is an integer number (1033993139400).

Almost surely, 2^{20610705656505} is an apocalyptic number.

It is an amenable number.

20610705656505 is a deficient number, since it is larger than the sum of its proper divisors (12477074804295).

20610705656505 is a wasteful number, since it uses less digits than its factorization.

20610705656505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616721.

The product of its (nonzero) digits is 1890000, while the sum is 48.

The spelling of 20610705656505 in words is "twenty trillion, six hundred ten billion, seven hundred five million, six hundred fifty-six thousand, five hundred five".