20391042210 has 192 divisors, whose sum is σ = 62117750016. Its totient is φ = 4192911360.

The previous prime is 20391042209. The next prime is 20391042233. The reversal of 20391042210 is 1224019302.

It is an unprimeable number.

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, 2460634 + ... + 2468906.

It is an arithmetic number, because the mean of its divisors is an integer number (323529948).

Almost surely, 2^20391042210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20391042210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31058875008).

20391042210 is an abundant number, since it is smaller than the sum of its proper divisors (41726707806).

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

20391042210 is a wasteful number, since it uses less digits than its factorization.

20391042210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8409 (or 8398 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The spelling of 20391042210 in words is "twenty billion, three hundred ninety-one million, forty-two thousand, two hundred ten".