20812445 has 8 divisors (see below), whose sum is σ = 24999936. Its totient is φ = 16633296.

The previous prime is 20812433. The next prime is 20812483. The reversal of 20812445 is 54421802.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20812445 - 2⁶ = 20812381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7064 + ... + 9566.

It is an arithmetic number, because the mean of its divisors is an integer number (3124992).

Almost surely, 2^20812445 is an apocalyptic number.

It is an amenable number.

20812445 is a deficient number, since it is larger than the sum of its proper divisors (4187491).

20812445 is a wasteful number, since it uses less digits than its factorization.

20812445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4171.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 20812445 is about 4562.0658697568. The cubic root of 20812445 is about 275.0686109797.

The spelling of 20812445 in words is "twenty million, eight hundred twelve thousand, four hundred forty-five".