20007477 has 48 divisors (see below), whose sum is σ = 35043840. Its totient is φ = 10757376.

The previous prime is 20007457. The next prime is 20007479. The reversal of 20007477 is 77470002.

It is a happy number.

It is not a de Polignac number, because 20007477 - 2¹¹ = 20005429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20007477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20007479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 85753 + ... + 85985.

It is an arithmetic number, because the mean of its divisors is an integer number (730080).

Almost surely, 2^20007477 is an apocalyptic number.

It is an amenable number.

20007477 is a deficient number, since it is larger than the sum of its proper divisors (15036363).

20007477 is a wasteful number, since it uses less digits than its factorization.

20007477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 27.

The square root of 20007477 is about 4472.9718308972. The cubic root of 20007477 is about 271.4755836126.

Adding to 20007477 its reverse (77470002), we get a palindrome (97477479).

The spelling of 20007477 in words is "twenty million, seven thousand, four hundred seventy-seven".