20400343110 has 192 divisors, whose sum is σ = 61522965504. Its totient is φ = 4593888000.

The previous prime is 20400343079. The next prime is 20400343123. The reversal of 20400343110 is 1134300402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12461212 + ... + 12462848.

It is an arithmetic number, because the mean of its divisors is an integer number (320432112).

Almost surely, 2^20400343110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20400343110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30761482752).

20400343110 is an abundant number, since it is smaller than the sum of its proper divisors (41122622394).

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

20400343110 is a wasteful number, since it uses less digits than its factorization.

20400343110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939 (or 1936 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20400343110 its reverse (1134300402), we get a palindrome (21534643512).

The spelling of 20400343110 in words is "twenty billion, four hundred million, three hundred forty-three thousand, one hundred ten".