20485687177 has 8 divisors (see below), whose sum is σ = 21079756872. Its totient is φ = 19893744000.

The previous prime is 20485687151. The next prime is 20485687231. The reversal of 20485687177 is 77178658402.

It can be written as a sum of positive squares in 4 ways, for example, as 5732912656 + 14752774521 = 75716^2 + 121461^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20485687177 is a prime.

It is a super-2 number, since 2×20485687177² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20485387177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512074 + ... + 550627.

It is an arithmetic number, because the mean of its divisors is an integer number (2634969609).

Almost surely, 2^20485687177 is an apocalyptic number.

It is an amenable number.

20485687177 is a deficient number, since it is larger than the sum of its proper divisors (594069695).

20485687177 is a wasteful number, since it uses less digits than its factorization.

20485687177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063259.

The product of its (nonzero) digits is 5268480, while the sum is 55.

The spelling of 20485687177 in words is "twenty billion, four hundred eighty-five million, six hundred eighty-seven thousand, one hundred seventy-seven".