20545102 has 4 divisors (see below), whose sum is σ = 30817656. Its totient is φ = 10272550.

The previous prime is 20545097. The next prime is 20545127. The reversal of 20545102 is 20154502.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20545102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5136274 + ... + 5136277.

It is an arithmetic number, because the mean of its divisors is an integer number (7704414).

Almost surely, 2^20545102 is an apocalyptic number.

20545102 is a deficient number, since it is larger than the sum of its proper divisors (10272554).

20545102 is a wasteful number, since it uses less digits than its factorization.

20545102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10272553.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20545102 is about 4532.6705152702. The cubic root of 20545102 is about 273.8857480931.

Adding to 20545102 its reverse (20154502), we get a palindrome (40699604).

The spelling of 20545102 in words is "twenty million, five hundred forty-five thousand, one hundred two".