155602020 has 384 divisors, whose sum is σ = 588349440. Its totient is φ = 29859840.

The previous prime is 155601977. The next prime is 155602043. The reversal of 155602020 is 20206551.

155602020 = 112² + 113² + ... + 776².

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

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 127 ways as a sum of consecutive naturals, for example, 4205442 + ... + 4205478.

It is an arithmetic number, because the mean of its divisors is an integer number (1532160).

Almost surely, 2^155602020 is an apocalyptic number.

155602020 is a gapful number since it is divisible by the number (10) 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 155602020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294174720).

155602020 is an abundant number, since it is smaller than the sum of its proper divisors (432747420).

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

155602020 is a wasteful number, since it uses less digits than its factorization.

155602020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 155602020 is about 12474.0538719375. The cubic root of 155602020 is about 537.8630912482.

Adding to 155602020 its reverse (20206551), we get a palindrome (175808571).

The spelling of 155602020 in words is "one hundred fifty-five million, six hundred two thousand, twenty".