20007666261 has 48 divisors (see below), whose sum is σ = 32434826112. Its totient is φ = 11781244800.

The previous prime is 20007666257. The next prime is 20007666281. The reversal of 20007666261 is 16266670002.

It is not a de Polignac number, because 20007666261 - 2² = 20007666257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20007666281) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 521931 + ... + 558951.

It is an arithmetic number, because the mean of its divisors is an integer number (675725544).

Almost surely, 2^20007666261 is an apocalyptic number.

It is an amenable number.

20007666261 is a deficient number, since it is larger than the sum of its proper divisors (12427159851).

20007666261 is a wasteful number, since it uses less digits than its factorization.

20007666261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37194 (or 37191 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The spelling of 20007666261 in words is "twenty billion, seven million, six hundred sixty-six thousand, two hundred sixty-one".