20851270902 has 192 divisors, whose sum is σ = 58888028160. Its totient is φ = 5174020800.

The previous prime is 20851270897. The next prime is 20851270907. The reversal of 20851270902 is 20907215802.

It is an interprime number because it is at equal distance from previous prime (20851270897) and next prime (20851270907).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20851270907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3391243 + ... + 3397385.

It is an arithmetic number, because the mean of its divisors is an integer number (306708480).

Almost surely, 2^20851270902 is an apocalyptic number.

20851270902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20851270902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29444014080).

20851270902 is an abundant number, since it is smaller than the sum of its proper divisors (38036757258).

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

20851270902 is a wasteful number, since it uses less digits than its factorization.

20851270902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6279 (or 6276 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 20851270902 in words is "twenty billion, eight hundred fifty-one million, two hundred seventy thousand, nine hundred two".