20249619 has 16 divisors (see below), whose sum is σ = 29864352. Its totient is φ = 12123648.

The previous prime is 20249599. The next prime is 20249633. The reversal of 20249619 is 91694202.

It is not a de Polignac number, because 20249619 - 2¹⁵ = 20216851 is a prime.

It is a super-2 number, since 2×20249619² = 820094139290322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20249619.

It is not an unprimeable number, because it can be changed into a prime (20249699) 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 in 15 ways as a sum of consecutive naturals, for example, 5574 + ... + 8459.

It is an arithmetic number, because the mean of its divisors is an integer number (1866522).

Almost surely, 2^20249619 is an apocalyptic number.

20249619 is a deficient number, since it is larger than the sum of its proper divisors (9614733).

20249619 is a wasteful number, since it uses less digits than its factorization.

20249619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14086.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20249619 is about 4499.9576664675. The cubic root of 20249619 is about 272.5663794747.

The spelling of 20249619 in words is "twenty million, two hundred forty-nine thousand, six hundred nineteen".