20919030 has 32 divisors (see below), whose sum is σ = 54770688. Its totient is φ = 5071200.

The previous prime is 20919011. The next prime is 20919037. The reversal of 20919030 is 3091902.

It is a happy number.

It is a super-2 number, since 2×20919030² = 875211632281800, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20919037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31366 + ... + 32025.

It is an arithmetic number, because the mean of its divisors is an integer number (1711584).

Almost surely, 2^20919030 is an apocalyptic number.

20919030 is an abundant number, since it is smaller than the sum of its proper divisors (33851658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20919030 is a wasteful number, since it uses less digits than its factorization.

20919030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63412.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 20919030 is about 4573.7326113362. The cubic root of 20919030 is about 275.5373734848.

The spelling of 20919030 in words is "twenty million, nine hundred nineteen thousand, thirty".