155504020 has 24 divisors (see below), whose sum is σ = 373209984. Its totient is φ = 53315616.

The previous prime is 155504009. The next prime is 155504023. The reversal of 155504020 is 20405551.

It is a junction number, because it is equal to n+sod(n) for n = 155503982 and 155504000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155504023) 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, 555232 + ... + 555511.

It is an arithmetic number, because the mean of its divisors is an integer number (15550416).

Almost surely, 2^155504020 is an apocalyptic number.

155504020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155504020 is an abundant number, since it is smaller than the sum of its proper divisors (217705964).

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

155504020 is a wasteful number, since it uses less digits than its factorization.

155504020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110759 (or 1110757 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 155504020 is about 12470.1250996131. The cubic root of 155504020 is about 537.7501500136.

Adding to 155504020 its reverse (20405551), we get a palindrome (175909571).

The spelling of 155504020 in words is "one hundred fifty-five million, five hundred four thousand, twenty".