20726417 has 8 divisors (see below), whose sum is σ = 21994056. Its totient is φ = 19464192.

The previous prime is 20726399. The next prime is 20726437. The reversal of 20726417 is 71462702.

It can be written as a sum of positive squares in 4 ways, for example, as 5013121 + 15713296 = 2239^2 + 3964^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20726417 - 2¹⁶ = 20660881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20726417.

It is not an unprimeable number, because it can be changed into a prime (20726437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8753 + ... + 10865.

It is an arithmetic number, because the mean of its divisors is an integer number (2749257).

Almost surely, 2^20726417 is an apocalyptic number.

It is an amenable number.

20726417 is a deficient number, since it is larger than the sum of its proper divisors (1267639).

20726417 is a wasteful number, since it uses less digits than its factorization.

20726417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2707.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 20726417 is about 4552.6274831135. The cubic root of 20726417 is about 274.6890899455.

The spelling of 20726417 in words is "twenty million, seven hundred twenty-six thousand, four hundred seventeen".