20477919 has 24 divisors (see below), whose sum is σ = 34303360. Its totient is φ = 10636560.

The previous prime is 20477917. The next prime is 20477923. The reversal of 20477919 is 91977402.

It is not a de Polignac number, because 20477919 - 2¹ = 20477917 is a prime.

It is a super-2 number, since 2×20477919² = 838690333141122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20477917) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1489 + ... + 6570.

Almost surely, 2^20477919 is an apocalyptic number.

20477919 is a deficient number, since it is larger than the sum of its proper divisors (13825441).

20477919 is a wasteful number, since it uses less digits than its factorization.

20477919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8091 (or 8080 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 20477919 is about 4525.2534735637. The cubic root of 20477919 is about 273.5868843316.

The spelling of 20477919 in words is "twenty million, four hundred seventy-seven thousand, nine hundred nineteen".