20493442 has 4 divisors (see below), whose sum is σ = 30740166. Its totient is φ = 10246720.

The previous prime is 20493433. The next prime is 20493443. The reversal of 20493442 is 24439402.

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

It can be written as a sum of positive squares in only one way, i.e., 13476241 + 7017201 = 3671^2 + 2649^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20493442.

It is not an unprimeable number, because it can be changed into a prime (20493443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5123359 + ... + 5123362.

Almost surely, 2^20493442 is an apocalyptic number.

20493442 is a deficient number, since it is larger than the sum of its proper divisors (10246724).

20493442 is a wasteful number, since it uses less digits than its factorization.

20493442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10246723.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20493442 is about 4526.9683011923. The cubic root of 20493442 is about 273.6559964414.

The spelling of 20493442 in words is "twenty million, four hundred ninety-three thousand, four hundred forty-two".