20802135210 has 64 divisors (see below), whose sum is σ = 51501239424. Its totient is φ = 5374828800.

The previous prime is 20802135169. The next prime is 20802135223. The reversal of 20802135210 is 1253120802.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37780 + ... + 207440.

It is an arithmetic number, because the mean of its divisors is an integer number (804706866).

Almost surely, 2^20802135210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20802135210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25750619712).

20802135210 is an abundant number, since it is smaller than the sum of its proper divisors (30699104214).

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

20802135210 is a wasteful number, since it uses less digits than its factorization.

20802135210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169799.

The product of its (nonzero) digits is 960, while the sum is 24.

The spelling of 20802135210 in words is "twenty billion, eight hundred two million, one hundred thirty-five thousand, two hundred ten".