20127745 has 48 divisors (see below), whose sum is σ = 29877120. Its totient is φ = 12925440.

The previous prime is 20127739. The next prime is 20127781. The reversal of 20127745 is 54772102.

It is not a de Polignac number, because 20127745 - 2⁵ = 20127713 is a prime.

It is a super-2 number, since 2×20127745² = 810252237570050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 195364 + ... + 195466.

It is an arithmetic number, because the mean of its divisors is an integer number (622440).

It is a Proth number, since it is equal to 2457 ⋅ 2¹³ + 1 and 2457 < 2¹³.

Almost surely, 2^20127745 is an apocalyptic number.

It is an amenable number.

20127745 is a deficient number, since it is larger than the sum of its proper divisors (9749375).

20127745 is a wasteful number, since it uses less digits than its factorization.

20127745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 20127745 is about 4486.3955465384. The cubic root of 20127745 is about 272.0184576935.

Adding to 20127745 its reverse (54772102), we get a palindrome (74899847).

It can be divided in two parts, 20 and 127745, that added together give a triangular number (127765 = T₅₀₅).

The spelling of 20127745 in words is "twenty million, one hundred twenty-seven thousand, seven hundred forty-five".