20475819 has 48 divisors (see below), whose sum is σ = 38019072. Its totient is φ = 10321344.

The previous prime is 20475817. The next prime is 20475839. The reversal of 20475819 is 91857402.

It is not a de Polignac number, because 20475819 - 2¹ = 20475817 is a prime.

It is a super-2 number, since 2×20475819² = 838518327441522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20475817) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18294 + ... + 19380.

It is an arithmetic number, because the mean of its divisors is an integer number (792064).

Almost surely, 2^20475819 is an apocalyptic number.

20475819 is a deficient number, since it is larger than the sum of its proper divisors (17543253).

20475819 is a wasteful number, since it uses less digits than its factorization.

20475819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136 (or 1133 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 20475819 is about 4525.0214364133. The cubic root of 20475819 is about 273.5775319474.

It can be divided in two parts, 20475 and 819, that multiplied together give a square (16769025 = 4095²).

The spelling of 20475819 in words is "twenty million, four hundred seventy-five thousand, eight hundred nineteen".