20205475406 has 32 divisors (see below), whose sum is σ = 32287648800. Its totient is φ = 9482505408.

The previous prime is 20205475331. The next prime is 20205475453. The reversal of 20205475406 is 60457450202.

It is a super-2 number, since 2×20205475406² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1488506 + ... + 1502018.

It is an arithmetic number, because the mean of its divisors is an integer number (1008989025).

Almost surely, 2^20205475406 is an apocalyptic number.

20205475406 is a deficient number, since it is larger than the sum of its proper divisors (12082173394).

20205475406 is a wasteful number, since it uses less digits than its factorization.

20205475406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13681 (or 13643 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 35.

The spelling of 20205475406 in words is "twenty billion, two hundred five million, four hundred seventy-five thousand, four hundred six".