20667707577 has 32 divisors (see below), whose sum is σ = 35160384000. Its totient is φ = 11866623120.

The previous prime is 20667707531. The next prime is 20667707579. The reversal of 20667707577 is 77570776602.

20667707577 is a `hidden beast` number, since 2 + 0 + 6 + 67 + 7 + 0 + 7 + 577 = 666.

It is not a de Polignac number, because 20667707577 - 2¹⁶ = 20667642041 is a prime.

It is a super-5 number, since 5×20667707577⁵ (a number of 53 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (20667707579) 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, 1825627 + ... + 1836912.

It is an arithmetic number, because the mean of its divisors is an integer number (1098762000).

Almost surely, 2^20667707577 is an apocalyptic number.

20667707577 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20667707577 is a deficient number, since it is larger than the sum of its proper divisors (14492676423).

20667707577 is a wasteful number, since it uses less digits than its factorization.

20667707577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3662578 (or 3662572 counting only the distinct ones).

The product of its (nonzero) digits is 6050520, while the sum is 54.

The spelling of 20667707577 in words is "twenty billion, six hundred sixty-seven million, seven hundred seven thousand, five hundred seventy-seven".