20726644 has 12 divisors (see below), whose sum is σ = 38180800. Its totient is φ = 9817848.

The previous prime is 20726627. The next prime is 20726647. The reversal of 20726644 is 44662702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20726647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136284 + ... + 136435.

Almost surely, 2^20726644 is an apocalyptic number.

It is an amenable number.

20726644 is a deficient number, since it is larger than the sum of its proper divisors (17454156).

20726644 is a wasteful number, since it uses less digits than its factorization.

20726644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272742 (or 272740 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 20726644 is about 4552.6524137035. The cubic root of 20726644 is about 274.6900927590.

The spelling of 20726644 in words is "twenty million, seven hundred twenty-six thousand, six hundred forty-four".