20401080 has 128 divisors (see below), whose sum is σ = 70848000. Its totient is φ = 4603392.

The previous prime is 20401063. The next prime is 20401093. The reversal of 20401080 is 8010402.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125079 + ... + 125241.

It is an arithmetic number, because the mean of its divisors is an integer number (553500).

Almost surely, 2^20401080 is an apocalyptic number.

20401080 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 20401080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35424000).

20401080 is an abundant number, since it is smaller than the sum of its proper divisors (50446920).

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

20401080 is a wasteful number, since it uses less digits than its factorization.

20401080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 20401080 is about 4516.7554726817. The cubic root of 20401080 is about 273.2442633969.

Adding to 20401080 its reverse (8010402), we get a palindrome (28411482).

The spelling of 20401080 in words is "twenty million, four hundred one thousand, eighty".