20726149 has 2 divisors, whose sum is σ = 20726150. Its totient is φ = 20726148.

The previous prime is 20726137. The next prime is 20726171. The reversal of 20726149 is 94162702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18922500 + 1803649 = 4350^2 + 1343^2 .

It is a cyclic number.

It is not a de Polignac number, because 20726149 - 2⁵ = 20726117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20726149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20726119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10363074 + 10363075.

It is an arithmetic number, because the mean of its divisors is an integer number (10363075).

Almost surely, 2^20726149 is an apocalyptic number.

It is an amenable number.

20726149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20726149 is an equidigital number, since it uses as much as digits as its factorization.

20726149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20726149 is about 4552.5980494658. The cubic root of 20726149 is about 274.6879059976.

The spelling of 20726149 in words is "twenty million, seven hundred twenty-six thousand, one hundred forty-nine".