20591146 has 4 divisors (see below), whose sum is σ = 30886722. Its totient is φ = 10295572.

The previous prime is 20591119. The next prime is 20591147. The reversal of 20591146 is 64119502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64119502 = 2 ⋅32059751.

It can be written as a sum of positive squares in only one way, i.e., 19456921 + 1134225 = 4411^2 + 1065^2 .

It is not an unprimeable number, because it can be changed into a prime (20591147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5147785 + ... + 5147788.

Almost surely, 2^20591146 is an apocalyptic number.

20591146 is a deficient number, since it is larger than the sum of its proper divisors (10295576).

20591146 is a wasteful number, since it uses less digits than its factorization.

20591146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10295575.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20591146 is about 4537.7467976960. The cubic root of 20591146 is about 274.0901988723.

The spelling of 20591146 in words is "twenty million, five hundred ninety-one thousand, one hundred forty-six".