155403020 has 12 divisors (see below), whose sum is σ = 326346384. Its totient is φ = 62161200.

The previous prime is 155403011. The next prime is 155403023. The reversal of 155403020 is 20304551.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 7770151 = 155403020 / (1 + 5 + 5 + 4 + 0 + 3 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 155402983 and 155403001.

It is not an unprimeable number, because it can be changed into a prime (155403023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3885056 + ... + 3885095.

It is an arithmetic number, because the mean of its divisors is an integer number (27195532).

Almost surely, 2^155403020 is an apocalyptic number.

155403020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155403020 is an abundant number, since it is smaller than the sum of its proper divisors (170943364).

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

155403020 is a wasteful number, since it uses less digits than its factorization.

155403020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7770160 (or 7770158 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 155403020 is about 12466.0747631321. The cubic root of 155403020 is about 537.6337017312.

Adding to 155403020 its reverse (20304551), we get a palindrome (175707571).

The spelling of 155403020 in words is "one hundred fifty-five million, four hundred three thousand, twenty".