20519490 has 16 divisors (see below), whose sum is σ = 49246848. Its totient is φ = 5471856.

The previous prime is 20519461. The next prime is 20519491. The reversal of 20519490 is 9491502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 683983 = 20519490 / (2 + 0 + 5 + 1 + 9 + 4 + 9 + 0).

It is not an unprimeable number, because it can be changed into a prime (20519491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341962 + ... + 342021.

It is an arithmetic number, because the mean of its divisors is an integer number (3077928).

Almost surely, 2^20519490 is an apocalyptic number.

20519490 is an abundant number, since it is smaller than the sum of its proper divisors (28727358).

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

20519490 is a wasteful number, since it uses less digits than its factorization.

20519490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683993.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20519490 is about 4529.8443681875. The cubic root of 20519490 is about 273.7718899949.

The spelling of 20519490 in words is "twenty million, five hundred nineteen thousand, four hundred ninety".