20726737 has 2 divisors, whose sum is σ = 20726738. Its totient is φ = 20726736.

The previous prime is 20726711. The next prime is 20726743. The reversal of 20726737 is 73762702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20439441 + 287296 = 4521^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 20726737 - 2⁷ = 20726609 is a prime.

It is not a weakly prime, because it can be changed into another prime (20726137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10363368 + 10363369.

It is an arithmetic number, because the mean of its divisors is an integer number (10363369).

Almost surely, 2^20726737 is an apocalyptic number.

It is an amenable number.

20726737 is a deficient number, since it is larger than the sum of its proper divisors (1).

20726737 is an equidigital number, since it uses as much as digits as its factorization.

20726737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24696, while the sum is 34.

The square root of 20726737 is about 4552.6626275181. The cubic root of 20726737 is about 274.6905036012.

The spelling of 20726737 in words is "twenty million, seven hundred twenty-six thousand, seven hundred thirty-seven".