20475131 has 4 divisors (see below), whose sum is σ = 21181200. Its totient is φ = 19769064.

The previous prime is 20475121. The next prime is 20475149. The reversal of 20475131 is 13157402.

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

It is a cyclic number.

It is not a de Polignac number, because 20475131 - 2¹⁴ = 20458747 is a prime.

It is a super-2 number, since 2×20475131² = 838461978934322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20475097 and 20475106.

It is not an unprimeable number, because it can be changed into a prime (20475101) 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, 352991 + ... + 353048.

It is an arithmetic number, because the mean of its divisors is an integer number (5295300).

Almost surely, 2^20475131 is an apocalyptic number.

20475131 is a deficient number, since it is larger than the sum of its proper divisors (706069).

20475131 is an equidigital number, since it uses as much as digits as its factorization.

20475131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706068.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20475131 is about 4524.9454140354. The cubic root of 20475131 is about 273.5744677892.

It can be divided in two parts, 20 and 475131, that multiplied together give a triangular number (9502620 = T₄₃₅₉).

The spelling of 20475131 in words is "twenty million, four hundred seventy-five thousand, one hundred thirty-one".