20145460 has 24 divisors (see below), whose sum is σ = 42728616. Its totient is φ = 7977600.

The previous prime is 20145449. The next prime is 20145487. The reversal of 20145460 is 6454102.

It can be written as a sum of positive squares in 4 ways, for example, as 3055504 + 17089956 = 1748^2 + 4134^2 .

It is a super-2 number, since 2×20145460² = 811679117223200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2967 + ... + 7006.

It is an arithmetic number, because the mean of its divisors is an integer number (1780359).

Almost surely, 2^20145460 is an apocalyptic number.

20145460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20145460 is an abundant number, since it is smaller than the sum of its proper divisors (22583156).

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

20145460 is a wasteful number, since it uses less digits than its factorization.

20145460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10083 (or 10081 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20145460 is about 4488.3694143865. The cubic root of 20145460 is about 272.0982380158.

Adding to 20145460 its reverse (6454102), we get a palindrome (26599562).

The spelling of 20145460 in words is "twenty million, one hundred forty-five thousand, four hundred sixty".