20700105155661 has 32 divisors (see below), whose sum is σ = 29260862991360. Its totient is φ = 12980295674496.

The previous prime is 20700105155647. The next prime is 20700105155669. The reversal of 20700105155661 is 16655150100702.

It is a happy number.

It is not a de Polignac number, because 20700105155661 - 2⁷ = 20700105155533 is a prime.

It is a super-2 number, since 2×20700105155661² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20700105155669) 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, 6889050 + ... + 9426516.

It is an arithmetic number, because the mean of its divisors is an integer number (914401968480).

Almost surely, 2^{20700105155661} is an apocalyptic number.

It is an amenable number.

20700105155661 is a deficient number, since it is larger than the sum of its proper divisors (8560757835699).

20700105155661 is a wasteful number, since it uses less digits than its factorization.

20700105155661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538513.

The product of its (nonzero) digits is 63000, while the sum is 39.

The spelling of 20700105155661 in words is "twenty trillion, seven hundred billion, one hundred five million, one hundred fifty-five thousand, six hundred sixty-one".