20517677425 has 24 divisors (see below), whose sum is σ = 29124532736. Its totient is φ = 14046013440.

The previous prime is 20517677419. The next prime is 20517677443. The reversal of 20517677425 is 52477671502.

It is a de Polignac number, because none of the positive numbers 2^k-20517677425 is a prime.

It is a super-3 number, since 3×20517677425³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9649 + ... + 202801.

Almost surely, 2^20517677425 is an apocalyptic number.

20517677425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20517677425 is a deficient number, since it is larger than the sum of its proper divisors (8606855311).

20517677425 is a wasteful number, since it uses less digits than its factorization.

20517677425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193777 (or 193772 counting only the distinct ones).

The product of its (nonzero) digits is 823200, while the sum is 46.

The spelling of 20517677425 in words is "twenty billion, five hundred seventeen million, six hundred seventy-seven thousand, four hundred twenty-five".