20480477 has 4 divisors (see below), whose sum is σ = 20683356. Its totient is φ = 20277600.

The previous prime is 20480431. The next prime is 20480479. The reversal of 20480477 is 77408402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77408402 = 2 ⋅38704201.

It can be written as a sum of positive squares in 2 ways, for example, as 15413476 + 5067001 = 3926^2 + 2251^2 .

It is a cyclic number.

It is not a de Polignac number, because 20480477 - 2¹⁸ = 20218333 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 (20480479) 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, 101288 + ... + 101489.

It is an arithmetic number, because the mean of its divisors is an integer number (5170839).

Almost surely, 2^20480477 is an apocalyptic number.

It is an amenable number.

20480477 is a deficient number, since it is larger than the sum of its proper divisors (202879).

20480477 is a wasteful number, since it uses less digits than its factorization.

20480477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202878.

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 20480477 is about 4525.5361008393. The cubic root of 20480477 is about 273.5982755625.

Adding to 20480477 its reverse (77408402), we get a palindrome (97888879).

The spelling of 20480477 in words is "twenty million, four hundred eighty thousand, four hundred seventy-seven".