20193491 has 4 divisors (see below), whose sum is σ = 20217912. Its totient is φ = 20169072.

The previous prime is 20193469. The next prime is 20193521. The reversal of 20193491 is 19439102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20193491 - 2¹⁸ = 19931347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20193421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10925 + ... + 12638.

It is an arithmetic number, because the mean of its divisors is an integer number (5054478).

Almost surely, 2^20193491 is an apocalyptic number.

20193491 is a deficient number, since it is larger than the sum of its proper divisors (24421).

20193491 is an equidigital number, since it uses as much as digits as its factorization.

20193491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24420.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 20193491 is about 4493.7168357608. The cubic root of 20193491 is about 272.3143127984.

The spelling of 20193491 in words is "twenty million, one hundred ninety-three thousand, four hundred ninety-one".