102405020 has 12 divisors (see below), whose sum is σ = 215050584. Its totient is φ = 40962000.

The previous prime is 102404987. The next prime is 102405049. The reversal of 102405020 is 20504201.

It is a junction number, because it is equal to n+sod(n) for n = 102404986 and 102405004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2560106 + ... + 2560145.

It is an arithmetic number, because the mean of its divisors is an integer number (17920882).

Almost surely, 2^102405020 is an apocalyptic number.

102405020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102405020 is an abundant number, since it is smaller than the sum of its proper divisors (112645564).

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

102405020 is a wasteful number, since it uses less digits than its factorization.

102405020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120260 (or 5120258 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 102405020 is about 10119.5365506529. The cubic root of 102405020 is about 467.8504830772.

Adding to 102405020 its reverse (20504201), we get a palindrome (122909221).

The spelling of 102405020 in words is "one hundred two million, four hundred five thousand, twenty".