20257460661 has 8 divisors (see below), whose sum is σ = 28598768064. Its totient is φ = 12710563520.

The previous prime is 20257460633. The next prime is 20257460677. The reversal of 20257460661 is 16606475202.

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 20257460661 - 2⁷ = 20257460533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20257460621) 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, 198602505 + ... + 198602606.

It is an arithmetic number, because the mean of its divisors is an integer number (3574846008).

Almost surely, 2^20257460661 is an apocalyptic number.

It is an amenable number.

20257460661 is a deficient number, since it is larger than the sum of its proper divisors (8341307403).

20257460661 is a wasteful number, since it uses less digits than its factorization.

20257460661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397205131.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 20257460661 in words is "twenty billion, two hundred fifty-seven million, four hundred sixty thousand, six hundred sixty-one".