20401023420 has 96 divisors (see below), whose sum is σ = 63491769600. Its totient is φ = 5438394432.

The previous prime is 20401023403. The next prime is 20401023421. The reversal of 20401023420 is 2432010402.

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

It is a junction number, because it is equal to n+sod(n) for n = 20401023393 and 20401023402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401023421) 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, 2338707 + ... + 2347413.

It is an arithmetic number, because the mean of its divisors is an integer number (661372600).

Almost surely, 2^20401023420 is an apocalyptic number.

20401023420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20401023420 is an abundant number, since it is smaller than the sum of its proper divisors (43090746180).

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

20401023420 is a wasteful number, since it uses less digits than its factorization.

20401023420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13064 (or 13056 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20401023420 its reverse (2432010402), we get a palindrome (22833033822).

The spelling of 20401023420 in words is "twenty billion, four hundred one million, twenty-three thousand, four hundred twenty".