20193791 has 2 divisors, whose sum is σ = 20193792. Its totient is φ = 20193790.

The previous prime is 20193779. The next prime is 20193799. The reversal of 20193791 is 19739102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20193791 - 2¹⁴ = 20177407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20193799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10096895 + 10096896.

It is an arithmetic number, because the mean of its divisors is an integer number (10096896).

Almost surely, 2^20193791 is an apocalyptic number.

20193791 is a deficient number, since it is larger than the sum of its proper divisors (1).

20193791 is an equidigital number, since it uses as much as digits as its factorization.

20193791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 20193791 is about 4493.7502155772. The cubic root of 20193791 is about 272.3156613170.

The spelling of 20193791 in words is "twenty million, one hundred ninety-three thousand, seven hundred ninety-one".