20791501 has 2 divisors, whose sum is σ = 20791502. Its totient is φ = 20791500.

The previous prime is 20791487. The next prime is 20791513. The reversal of 20791501 is 10519702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19811401 + 980100 = 4451^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 20791501 - 2²¹ = 18694349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20791801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10395750 + 10395751.

It is an arithmetic number, because the mean of its divisors is an integer number (10395751).

Almost surely, 2^20791501 is an apocalyptic number.

It is an amenable number.

20791501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20791501 is an equidigital number, since it uses as much as digits as its factorization.

20791501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 20791501 is about 4559.7698406828. The cubic root of 20791501 is about 274.9763109071.

The spelling of 20791501 in words is "twenty million, seven hundred ninety-one thousand, five hundred one".