20407080 has 64 divisors (see below), whose sum is σ = 61637760. Its totient is φ = 5404928.

The previous prime is 20407031. The next prime is 20407099. The reversal of 20407080 is 8070402.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20269 + ... + 21251.

It is an arithmetic number, because the mean of its divisors is an integer number (963090).

Almost surely, 2^20407080 is an apocalyptic number.

20407080 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 20407080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30818880).

20407080 is an abundant number, since it is smaller than the sum of its proper divisors (41230680).

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

20407080 is a wasteful number, since it uses less digits than its factorization.

20407080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170 (or 1166 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 20407080 is about 4517.4196174365. The cubic root of 20407080 is about 273.2710480064.

Adding to 20407080 its reverse (8070402), we get a palindrome (28477482).

The spelling of 20407080 in words is "twenty million, four hundred seven thousand, eighty".