20726505 has 12 divisors (see below), whose sum is σ = 35926020. Its totient is φ = 11054112.

The previous prime is 20726501. The next prime is 20726509. The reversal of 20726505 is 50562702.

20726505 is a `hidden beast` number, since 2 + 0 + 7 + 2 + 650 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (20726501) and next prime (20726509).

It can be written as a sum of positive squares in 2 ways, for example, as 3111696 + 17614809 = 1764^2 + 4197^2 .

It is not a de Polignac number, because 20726505 - 2² = 20726501 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20726501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 230250 + ... + 230339.

It is an arithmetic number, because the mean of its divisors is an integer number (2993835).

Almost surely, 2^20726505 is an apocalyptic number.

It is an amenable number.

20726505 is a deficient number, since it is larger than the sum of its proper divisors (15199515).

20726505 is a wasteful number, since it uses less digits than its factorization.

20726505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460600 (or 460597 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 20726505 is about 4552.6371478518. The cubic root of 20726505 is about 274.6894787023.

The spelling of 20726505 in words is "twenty million, seven hundred twenty-six thousand, five hundred five".