20722545 has 24 divisors (see below), whose sum is σ = 36122112. Its totient is φ = 10989600.

The previous prime is 20722543. The next prime is 20722549. The reversal of 20722545 is 54522702.

It is not a de Polignac number, because 20722545 - 2¹ = 20722543 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20722543) 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 23 ways as a sum of consecutive naturals, for example, 7390 + ... + 9800.

It is an arithmetic number, because the mean of its divisors is an integer number (1505088).

Almost surely, 2^20722545 is an apocalyptic number.

It is an amenable number.

20722545 is a deficient number, since it is larger than the sum of its proper divisors (15399567).

20722545 is a wasteful number, since it uses less digits than its factorization.

20722545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613 (or 2610 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 20722545 is about 4552.2022143134. The cubic root of 20722545 is about 274.6719835574.

The spelling of 20722545 in words is "twenty million, seven hundred twenty-two thousand, five hundred forty-five".