20755770257 has 8 divisors (see below), whose sum is σ = 20818914240. Its totient is φ = 20692692720.

The previous prime is 20755770241. The next prime is 20755770263. The reversal of 20755770257 is 75207755702.

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

It is a cyclic number.

It is not a de Polignac number, because 20755770257 - 2⁴ = 20755770241 is a prime.

It is a super-2 number, since 2×20755770257² (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 (20755773257) 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, 649148 + ... + 680370.

It is an arithmetic number, because the mean of its divisors is an integer number (2602364280).

Almost surely, 2^20755770257 is an apocalyptic number.

It is an amenable number.

20755770257 is a deficient number, since it is larger than the sum of its proper divisors (63143983).

20755770257 is a wasteful number, since it uses less digits than its factorization.

20755770257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33223.

The product of its (nonzero) digits is 1200500, while the sum is 47.

The spelling of 20755770257 in words is "twenty billion, seven hundred fifty-five million, seven hundred seventy thousand, two hundred fifty-seven".