20726545 has 16 divisors (see below), whose sum is σ = 28499328. Its totient is φ = 14175360.

The previous prime is 20726543. The next prime is 20726557. The reversal of 20726545 is 54562702.

It is not a de Polignac number, because 20726545 - 2¹ = 20726543 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20726543) 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, 23757 + ... + 24613.

It is an arithmetic number, because the mean of its divisors is an integer number (1781208).

Almost surely, 2^20726545 is an apocalyptic number.

It is an amenable number.

20726545 is a deficient number, since it is larger than the sum of its proper divisors (7772783).

20726545 is an equidigital number, since it uses as much as digits as its factorization.

20726545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 20726545 is about 4552.6415409079. The cubic root of 20726545 is about 274.6896554095.

The spelling of 20726545 in words is "twenty million, seven hundred twenty-six thousand, five hundred forty-five".