20100850820 has 24 divisors (see below), whose sum is σ = 42386949528. Its totient is φ = 8006976000.

The previous prime is 20100850799. The next prime is 20100850849. The reversal of 20100850820 is 2805800102.

It can be written as a sum of positive squares in 4 ways, for example, as 1330206784 + 18770644036 = 36472^2 + 137006^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20100850820.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2080331 + ... + 2089970.

It is an arithmetic number, because the mean of its divisors is an integer number (1766122897).

Almost surely, 2^20100850820 is an apocalyptic number.

20100850820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100850820 is an abundant number, since it is smaller than the sum of its proper divisors (22286098708).

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

20100850820 is a wasteful number, since it uses less digits than its factorization.

20100850820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4170551 (or 4170549 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The spelling of 20100850820 in words is "twenty billion, one hundred million, eight hundred fifty thousand, eight hundred twenty".