155020240 has 40 divisors (see below), whose sum is σ = 379395360. Its totient is φ = 58743936.

The previous prime is 155020237. The next prime is 155020249. The reversal of 155020240 is 42020551.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155020249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49474 + ... + 52513.

It is an arithmetic number, because the mean of its divisors is an integer number (9484884).

Almost surely, 2^155020240 is an apocalyptic number.

155020240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155020240 is an abundant number, since it is smaller than the sum of its proper divisors (224375120).

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

155020240 is a wasteful number, since it uses less digits than its factorization.

155020240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102019 (or 102013 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 155020240 is about 12450.7124294154. The cubic root of 155020240 is about 537.1919157482.

Adding to 155020240 its reverse (42020551), we get a palindrome (197040791).

The spelling of 155020240 in words is "one hundred fifty-five million, twenty thousand, two hundred forty".