20419477 has 4 divisors (see below), whose sum is σ = 21990220. Its totient is φ = 18848736.

The previous prime is 20419459. The next prime is 20419481. The reversal of 20419477 is 77491402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12348196 + 8071281 = 3514^2 + 2841^2 .

It is a cyclic number.

It is not a de Polignac number, because 20419477 - 2⁷ = 20419349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20419417) 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, 785352 + ... + 785377.

It is an arithmetic number, because the mean of its divisors is an integer number (5497555).

Almost surely, 2^20419477 is an apocalyptic number.

It is an amenable number.

20419477 is a deficient number, since it is larger than the sum of its proper divisors (1570743).

20419477 is a wasteful number, since it uses less digits than its factorization.

20419477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570742.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 20419477 is about 4518.7915419944. The cubic root of 20419477 is about 273.3263728481.

The spelling of 20419477 in words is "twenty million, four hundred nineteen thousand, four hundred seventy-seven".