20154540 has 96 divisors (see below), whose sum is σ = 65931264. Its totient is φ = 4504320.

The previous prime is 20154527. The next prime is 20154569. The reversal of 20154540 is 4545102.

It is a super-2 number, since 2×20154540² = 812410965223200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a plaindrome in base 16.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19230 + ... + 20250.

It is an arithmetic number, because the mean of its divisors is an integer number (686784).

Almost surely, 2^20154540 is an apocalyptic number.

20154540 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 20154540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32965632).

20154540 is an abundant number, since it is smaller than the sum of its proper divisors (45776724).

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

20154540 is a wasteful number, since it uses less digits than its factorization.

20154540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087 (or 1085 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 20154540 is about 4489.3808036298. The cubic root of 20154540 is about 272.1391120870.

Adding to 20154540 its reverse (4545102), we get a palindrome (24699642).

It can be divided in two parts, 2015 and 4540, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 20154540 in words is "twenty million, one hundred fifty-four thousand, five hundred forty".