20871757077 has 16 divisors (see below), whose sum is σ = 29044794240. Its totient is φ = 13306855232.

The previous prime is 20871757037. The next prime is 20871757087. The reversal of 20871757077 is 77075717802.

It is a cyclic number.

It is not a de Polignac number, because 20871757077 - 2⁷ = 20871756949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20871757037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350299 + ... + 405527.

It is an arithmetic number, because the mean of its divisors is an integer number (1815299640).

Almost surely, 2^20871757077 is an apocalyptic number.

It is an amenable number.

20871757077 is a deficient number, since it is larger than the sum of its proper divisors (8173037163).

20871757077 is a wasteful number, since it uses less digits than its factorization.

20871757077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60732.

The product of its (nonzero) digits is 1344560, while the sum is 51.

The spelling of 20871757077 in words is "twenty billion, eight hundred seventy-one million, seven hundred fifty-seven thousand, seventy-seven".