20726461 has 8 divisors (see below), whose sum is σ = 24171200. Its totient is φ = 17765244.

The previous prime is 20726441. The next prime is 20726471. The reversal of 20726461 is 16462702.

It is not a de Polignac number, because 20726461 - 2⁷ = 20726333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20726441) 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 7 ways as a sum of consecutive naturals, for example, 29871 + ... + 30556.

It is an arithmetic number, because the mean of its divisors is an integer number (3021400).

Almost surely, 2^20726461 is an apocalyptic number.

It is an amenable number.

20726461 is a deficient number, since it is larger than the sum of its proper divisors (3444739).

20726461 is an frugal number, since it uses more digits than its factorization.

20726461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60448 (or 60434 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20726461 is about 4552.6323154852. The cubic root of 20726461 is about 274.6892843240.

The spelling of 20726461 in words is "twenty million, seven hundred twenty-six thousand, four hundred sixty-one".