20826815204 has 12 divisors (see below), whose sum is σ = 39250536444. Its totient is φ = 9612376224.

The previous prime is 20826815183. The next prime is 20826815291. The reversal of 20826815204 is 40251862802.

It can be written as a sum of positive squares in 2 ways, for example, as 2591013604 + 18235801600 = 50902^2 + 135040^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200257787 + ... + 200257890.

It is an arithmetic number, because the mean of its divisors is an integer number (3270878037).

Almost surely, 2^20826815204 is an apocalyptic number.

It is an amenable number.

20826815204 is a deficient number, since it is larger than the sum of its proper divisors (18423721240).

20826815204 is a wasteful number, since it uses less digits than its factorization.

20826815204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400515694 (or 400515692 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 38.

The spelling of 20826815204 in words is "twenty billion, eight hundred twenty-six million, eight hundred fifteen thousand, two hundred four".