20853408508 has 24 divisors (see below), whose sum is σ = 37761000480. Its totient is φ = 10064725440.

The previous prime is 20853408503. The next prime is 20853408517. The reversal of 20853408508 is 80580435802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20853408503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516585 + ... + 555487.

It is an arithmetic number, because the mean of its divisors is an integer number (1573375020).

Almost surely, 2^20853408508 is an apocalyptic number.

It is an amenable number.

20853408508 is a deficient number, since it is larger than the sum of its proper divisors (16907591972).

20853408508 is a wasteful number, since it uses less digits than its factorization.

20853408508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43557 (or 43555 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 43.

The spelling of 20853408508 in words is "twenty billion, eight hundred fifty-three million, four hundred eight thousand, five hundred eight".