20651893 has 2 divisors, whose sum is σ = 20651894. Its totient is φ = 20651892.

The previous prime is 20651887. The next prime is 20651899. The reversal of 20651893 is 39815602.

It is a balanced prime because it is at equal distance from previous prime (20651887) and next prime (20651899).

It can be written as a sum of positive squares in only one way, i.e., 18861649 + 1790244 = 4343^2 + 1338^2 .

It is a cyclic number.

It is not a de Polignac number, because 20651893 - 2⁹ = 20651381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20651899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10325946 + 10325947.

It is an arithmetic number, because the mean of its divisors is an integer number (10325947).

Almost surely, 2^20651893 is an apocalyptic number.

It is an amenable number.

20651893 is a deficient number, since it is larger than the sum of its proper divisors (1).

20651893 is an equidigital number, since it uses as much as digits as its factorization.

20651893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20651893 is about 4544.4353884724. The cubic root of 20651893 is about 274.3594701179.

The spelling of 20651893 in words is "twenty million, six hundred fifty-one thousand, eight hundred ninety-three".