20690558 has 8 divisors (see below), whose sum is σ = 35469552. Its totient is φ = 8867376.

The previous prime is 20690539. The next prime is 20690591. The reversal of 20690558 is 85509602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×20690558³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 738935 + ... + 738962.

It is an arithmetic number, because the mean of its divisors is an integer number (4433694).

Almost surely, 2^20690558 is an apocalyptic number.

20690558 is a deficient number, since it is larger than the sum of its proper divisors (14778994).

20690558 is a wasteful number, since it uses less digits than its factorization.

20690558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477906.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 20690558 is about 4548.6875030057. The cubic root of 20690558 is about 274.5305843032.

The spelling of 20690558 in words is "twenty million, six hundred ninety thousand, five hundred fifty-eight".