20251080 has 128 divisors (see below), whose sum is σ = 71539200. Its totient is φ = 5078016.

The previous prime is 20251079. The next prime is 20251081. The reversal of 20251080 is 8015202.

It is an interprime number because it is at equal distance from previous prime (20251079) and next prime (20251081).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20251081) 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, 17809 + ... + 18911.

It is an arithmetic number, because the mean of its divisors is an integer number (558900).

Almost surely, 2^20251080 is an apocalyptic number.

20251080 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 20251080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35769600).

20251080 is an abundant number, since it is smaller than the sum of its proper divisors (51288120).

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

20251080 is a wasteful number, since it uses less digits than its factorization.

20251080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140 (or 1130 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 20251080 is about 4500.1199984000. The cubic root of 20251080 is about 272.5729344936.

Adding to 20251080 its reverse (8015202), we get a palindrome (28266282).

The spelling of 20251080 in words is "twenty million, two hundred fifty-one thousand, eighty".