20506726 has 16 divisors (see below), whose sum is σ = 32725296. Its totient is φ = 9604096.

The previous prime is 20506723. The next prime is 20506729. The reversal of 20506726 is 62760502.

It is an interprime number because it is at equal distance from previous prime (20506723) and next prime (20506729).

It is a super-2 number, since 2×20506726² = 841051622478152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20506694 and 20506703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506723) 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, 6390 + ... + 9046.

It is an arithmetic number, because the mean of its divisors is an integer number (2045331).

Almost surely, 2^20506726 is an apocalyptic number.

20506726 is a deficient number, since it is larger than the sum of its proper divisors (12218570).

20506726 is a wasteful number, since it uses less digits than its factorization.

20506726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20506726 is about 4528.4352705984. The cubic root of 20506726 is about 273.7151122808.

The spelling of 20506726 in words is "twenty million, five hundred six thousand, seven hundred twenty-six".