20285147208 has 32 divisors (see below), whose sum is σ = 51949769760. Its totient is φ = 6596795520.

The previous prime is 20285147189. The next prime is 20285147209. The reversal of 20285147208 is 80274158202.

It is a super-2 number, since 2×20285147208² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20285147209) 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, 10306510 + ... + 10308477.

It is an arithmetic number, because the mean of its divisors is an integer number (1623430305).

Almost surely, 2^20285147208 is an apocalyptic number.

It is an amenable number.

20285147208 is an abundant number, since it is smaller than the sum of its proper divisors (31664622552).

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

20285147208 is a wasteful number, since it uses less digits than its factorization.

20285147208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20615037 (or 20615033 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 39.

The spelling of 20285147208 in words is "twenty billion, two hundred eighty-five million, one hundred forty-seven thousand, two hundred eight".