20919590 has 8 divisors (see below), whose sum is σ = 37655280. Its totient is φ = 8367832.

The previous prime is 20919557. The next prime is 20919593. The reversal of 20919590 is 9591902.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20919590.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20919593) 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, 1045970 + ... + 1045989.

It is an arithmetic number, because the mean of its divisors is an integer number (4706910).

Almost surely, 2^20919590 is an apocalyptic number.

20919590 is a deficient number, since it is larger than the sum of its proper divisors (16735690).

20919590 is a wasteful number, since it uses less digits than its factorization.

20919590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091966.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 20919590 is about 4573.7938300715. The cubic root of 20919590 is about 275.5398321640.

The spelling of 20919590 in words is "twenty million, nine hundred nineteen thousand, five hundred ninety".