20109292820 has 24 divisors (see below), whose sum is σ = 42232281000. Its totient is φ = 8043190272.

The previous prime is 20109292787. The next prime is 20109292831. The reversal of 20109292820 is 2829290102.

It can be written as a sum of positive squares in 4 ways, for example, as 920394244 + 19188898576 = 30338^2 + 138524^2 .

It is a congruent number.

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, 460076 + ... + 501884.

It is an arithmetic number, because the mean of its divisors is an integer number (1759678375).

Almost surely, 2^20109292820 is an apocalyptic number.

20109292820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20109292820 is an abundant number, since it is smaller than the sum of its proper divisors (22122988180).

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

20109292820 is a wasteful number, since it uses less digits than its factorization.

20109292820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65867 (or 65865 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 20109292820 in words is "twenty billion, one hundred nine million, two hundred ninety-two thousand, eight hundred twenty".