20690498 has 4 divisors (see below), whose sum is σ = 31035750. Its totient is φ = 10345248.

The previous prime is 20690497. The next prime is 20690503. The reversal of 20690498 is 89409602.

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., 16459249 + 4231249 = 4057^2 + 2057^2 .

It is not an unprimeable number, because it can be changed into a prime (20690497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5172623 + ... + 5172626.

Almost surely, 2^20690498 is an apocalyptic number.

20690498 is a deficient number, since it is larger than the sum of its proper divisors (10345252).

20690498 is a wasteful number, since it uses less digits than its factorization.

20690498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10345251.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 20690498 is about 4548.6809076918. The cubic root of 20690498 is about 274.5303189349.

The spelling of 20690498 in words is "twenty million, six hundred ninety thousand, four hundred ninety-eight".