20820907874 has 16 divisors (see below), whose sum is σ = 33640289088. Its totient is φ = 9607788432.

The previous prime is 20820907871. The next prime is 20820907897. The reversal of 20820907874 is 47870902802.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20820907871) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 64139 + ... + 213905.

It is an arithmetic number, because the mean of its divisors is an integer number (2102518068).

Almost surely, 2^20820907874 is an apocalyptic number.

20820907874 is a deficient number, since it is larger than the sum of its proper divisors (12819381214).

20820907874 is a wasteful number, since it uses less digits than its factorization.

20820907874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155129.

The product of its (nonzero) digits is 451584, while the sum is 47.

The spelling of 20820907874 in words is "twenty billion, eight hundred twenty million, nine hundred seven thousand, eight hundred seventy-four".