20002545 has 48 divisors (see below), whose sum is σ = 36533952. Its totient is φ = 10497600.

The previous prime is 20002537. The next prime is 20002553. The reversal of 20002545 is 54520002.

It is an interprime number because it is at equal distance from previous prime (20002537) and next prime (20002553).

It is not a de Polignac number, because 20002545 - 2³ = 20002537 is a prime.

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 47 ways as a sum of consecutive naturals, for example, 122634 + ... + 122796.

It is an arithmetic number, because the mean of its divisors is an integer number (761124).

Almost surely, 2^20002545 is an apocalyptic number.

It is an amenable number.

20002545 is a deficient number, since it is larger than the sum of its proper divisors (16531407).

20002545 is a wasteful number, since it uses less digits than its factorization.

20002545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20002545 is about 4472.4204855984. The cubic root of 20002545 is about 271.4532748259.

Adding to 20002545 its reverse (54520002), we get a palindrome (74522547).

The spelling of 20002545 in words is "twenty million, two thousand, five hundred forty-five".