20746501 has 2 divisors, whose sum is σ = 20746502. Its totient is φ = 20746500.

The previous prime is 20746487. The next prime is 20746507. The reversal of 20746501 is 10564702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14861025 + 5885476 = 3855^2 + 2426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20746501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20746507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10373250 + 10373251.

It is an arithmetic number, because the mean of its divisors is an integer number (10373251).

Almost surely, 2^20746501 is an apocalyptic number.

It is an amenable number.

20746501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20746501 is an equidigital number, since it uses as much as digits as its factorization.

20746501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20746501 is about 4554.8327082342. The cubic root of 20746501 is about 274.7777863289. Note that the first 4 decimals are identical.

The spelling of 20746501 in words is "twenty million, seven hundred forty-six thousand, five hundred one".