20401120 has 24 divisors (see below), whose sum is σ = 48198024. Its totient is φ = 8160384.

The previous prime is 20401111. The next prime is 20401127. The reversal of 20401120 is 2110402.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20401097 and 20401106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63594 + ... + 63913.

It is an arithmetic number, because the mean of its divisors is an integer number (2008251).

Almost surely, 2^20401120 is an apocalyptic number.

20401120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20401120 is an abundant number, since it is smaller than the sum of its proper divisors (27796904).

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

20401120 is a wasteful number, since it uses less digits than its factorization.

20401120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127522 (or 127514 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 20401120 is about 4516.7599006367. The cubic root of 20401120 is about 273.2444419783.

Adding to 20401120 its reverse (2110402), we get a palindrome (22511522).

It can be divided in two parts, 2040 and 1120, that added together give a triangular number (3160 = T₇₉).

The spelling of 20401120 in words is "twenty million, four hundred one thousand, one hundred twenty".