20154240 has 96 divisors (see below), whose sum is σ = 69615000. Its totient is φ = 5372928.

The previous prime is 20154227. The next prime is 20154271. The reversal of 20154240 is 4245102.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4011 + ... + 7509.

Almost surely, 2^20154240 is an apocalyptic number.

20154240 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 20154240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34807500).

20154240 is an abundant number, since it is smaller than the sum of its proper divisors (49460760).

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

20154240 is a wasteful number, since it uses less digits than its factorization.

20154240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3524 (or 3509 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20154240 is about 4489.3473913254. The cubic root of 20154240 is about 272.1377618182.

Adding to 20154240 its reverse (4245102), we get a palindrome (24399342).

The spelling of 20154240 in words is "twenty million, one hundred fifty-four thousand, two hundred forty".