20560749 has 16 divisors (see below), whose sum is σ = 29998080. Its totient is φ = 12422960.

The previous prime is 20560703. The next prime is 20560807. The reversal of 20560749 is 94706502.

It is not a de Polignac number, because 20560749 - 2¹³ = 20552557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20560649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13084 + ... + 14570.

It is an arithmetic number, because the mean of its divisors is an integer number (1874880).

Almost surely, 2^20560749 is an apocalyptic number.

It is an amenable number.

20560749 is a deficient number, since it is larger than the sum of its proper divisors (9437331).

20560749 is a wasteful number, since it uses less digits than its factorization.

20560749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20560749 is about 4534.3962111840. The cubic root of 20560749 is about 273.9552602462.

Subtracting 20560749 from its reverse (94706502), we obtain a triangular number (74145753 = T₁₂₁₇₇).

The spelling of 20560749 in words is "twenty million, five hundred sixty thousand, seven hundred forty-nine".