20456406 has 24 divisors (see below), whose sum is σ = 46930104. Its totient is φ = 6417600.

The previous prime is 20456393. The next prime is 20456419. The reversal of 20456406 is 60465402.

It is a happy number.

20456406 is a `hidden beast` number, since 204 + 56 + 406 = 666.

It is an interprime number because it is at equal distance from previous prime (20456393) and next prime (20456419).

It is a self number, because there is not a number n which added to its sum of digits gives 20456406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33120 + ... + 33731.

It is an arithmetic number, because the mean of its divisors is an integer number (1955421).

Almost surely, 2^20456406 is an apocalyptic number.

20456406 is an abundant number, since it is smaller than the sum of its proper divisors (26473698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20456406 is a wasteful number, since it uses less digits than its factorization.

20456406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66876 (or 66873 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20456406 is about 4522.8758550285. The cubic root of 20456406 is about 273.4910455421.

The spelling of 20456406 in words is "twenty million, four hundred fifty-six thousand, four hundred six".