20657988049 has 8 divisors (see below), whose sum is σ = 20790097632. Its totient is φ = 20525944320.

The previous prime is 20657987969. The next prime is 20657988059. The reversal of 20657988049 is 94088975602.

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 20657988049 - 2²⁵ = 20624433617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20657987984 and 20657988002.

It is not an unprimeable number, because it can be changed into a prime (20657988059) 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, 716262 + ... + 744544.

It is an arithmetic number, because the mean of its divisors is an integer number (2598762204).

Almost surely, 2^20657988049 is an apocalyptic number.

It is an amenable number.

20657988049 is a deficient number, since it is larger than the sum of its proper divisors (132109583).

20657988049 is a wasteful number, since it uses less digits than its factorization.

20657988049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32927.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 20657988049 in words is "twenty billion, six hundred fifty-seven million, nine hundred eighty-eight thousand, forty-nine".