20211423140 has 48 divisors (see below), whose sum is σ = 43578138240. Its totient is φ = 7869438720.

The previous prime is 20211423137. The next prime is 20211423149. The reversal of 20211423140 is 4132411202.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (20211423149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 335441 + ... + 391079.

It is an arithmetic number, because the mean of its divisors is an integer number (907877880).

Almost surely, 2^20211423140 is an apocalyptic number.

20211423140 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 20211423140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21789069120).

20211423140 is an abundant number, since it is smaller than the sum of its proper divisors (23366715100).

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

20211423140 is a wasteful number, since it uses less digits than its factorization.

20211423140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56132 (or 56130 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20211423140 its reverse (4132411202), we get a palindrome (24343834342).

The spelling of 20211423140 in words is "twenty billion, two hundred eleven million, four hundred twenty-three thousand, one hundred forty".