20020545 has 12 divisors (see below), whose sum is σ = 34702356. Its totient is φ = 10677600.

The previous prime is 20020541. The next prime is 20020571. The reversal of 20020545 is 54502002.

It can be written as a sum of positive squares in 2 ways, for example, as 12616704 + 7403841 = 3552^2 + 2721^2 .

It is not a de Polignac number, because 20020545 - 2² = 20020541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20020541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222406 + ... + 222495.

It is an arithmetic number, because the mean of its divisors is an integer number (2891863).

Almost surely, 2^20020545 is an apocalyptic number.

It is an amenable number.

20020545 is a deficient number, since it is larger than the sum of its proper divisors (14681811).

20020545 is a wasteful number, since it uses less digits than its factorization.

20020545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444912 (or 444909 counting only the distinct ones).

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

The square root of 20020545 is about 4474.4323662337. The cubic root of 20020545 is about 271.5346760345.

Adding to 20020545 its reverse (54502002), we get a palindrome (74522547).

The spelling of 20020545 in words is "twenty million, twenty thousand, five hundred forty-five".