20102355 has 48 divisors (see below), whose sum is σ = 42893760. Its totient is φ = 8481024.

The previous prime is 20102321. The next prime is 20102389. The reversal of 20102355 is 55320102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20102321) and next prime (20102389).

It is not a de Polignac number, because 20102355 - 2⁷ = 20102227 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1641 + ... + 6549.

It is an arithmetic number, because the mean of its divisors is an integer number (893620).

Almost surely, 2^20102355 is an apocalyptic number.

20102355 is an abundant number, since it is smaller than the sum of its proper divisors (22791405).

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

20102355 is a wasteful number, since it uses less digits than its factorization.

20102355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4940 (or 4937 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20102355 is about 4483.5649878194. The cubic root of 20102355 is about 271.9040309863.

Adding to 20102355 its reverse (55320102), we get a palindrome (75422457).

The spelling of 20102355 in words is "twenty million, one hundred two thousand, three hundred fifty-five".