20400231020 has 96 divisors (see below), whose sum is σ = 47311147968. Its totient is φ = 7342866432.

The previous prime is 20400230959. The next prime is 20400231023. The reversal of 20400231020 is 2013200402.

It is a junction number, because it is equal to n+sod(n) for n = 20400230986 and 20400231004.

It is not an unprimeable number, because it can be changed into a prime (20400231023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1683704 + ... + 1695776.

It is an arithmetic number, because the mean of its divisors is an integer number (492824458).

Almost surely, 2^20400231020 is an apocalyptic number.

20400231020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20400231020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23655573984).

20400231020 is an abundant number, since it is smaller than the sum of its proper divisors (26910916948).

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

20400231020 is a wasteful number, since it uses less digits than its factorization.

20400231020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12259 (or 12257 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 20400231020 its reverse (2013200402), we get a palindrome (22413431422).

The spelling of 20400231020 in words is "twenty billion, four hundred million, two hundred thirty-one thousand, twenty".