20401420320 has 96 divisors (see below), whose sum is σ = 71404986240. Its totient is φ = 5440377600.

The previous prime is 20401420307. The next prime is 20401420321. The reversal of 20401420320 is 2302410402.

20401420320 is a `hidden beast` number, since 204 + 0 + 142 + 0 + 320 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

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 = 20401420293 and 20401420302.

It is not an unprimeable number, because it can be changed into a prime (20401420321) 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, 2356956 + ... + 2365595.

It is an arithmetic number, because the mean of its divisors is an integer number (743801940).

Almost surely, 2^20401420320 is an apocalyptic number.

20401420320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20401420320 is an abundant number, since it is smaller than the sum of its proper divisors (51003565920).

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

20401420320 is a wasteful number, since it uses less digits than its factorization.

20401420320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4722575 (or 4722561 counting only the distinct ones).

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

Adding to 20401420320 its reverse (2302410402), we get a palindrome (22703830722).

The spelling of 20401420320 in words is "twenty billion, four hundred one million, four hundred twenty thousand, three hundred twenty".