20745549 has 48 divisors (see below), whose sum is σ = 35380800. Its totient is φ = 11577600.

The previous prime is 20745547. The next prime is 20745581. The reversal of 20745549 is 94554702.

It is not a de Polignac number, because 20745549 - 2¹ = 20745547 is a prime.

It is a super-2 number, since 2×20745549² = 860755606622802, which contains 22 as substring.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20745547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 76987 + ... + 77255.

It is an arithmetic number, because the mean of its divisors is an integer number (737100).

Almost surely, 2^20745549 is an apocalyptic number.

It is an amenable number.

20745549 is a deficient number, since it is larger than the sum of its proper divisors (14635251).

20745549 is a wasteful number, since it uses less digits than its factorization.

20745549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 20745549 is about 4554.7282026483. The cubic root of 20745549 is about 274.7735833317.

The spelling of 20745549 in words is "twenty million, seven hundred forty-five thousand, five hundred forty-nine".