20015144566 has 4 divisors (see below), whose sum is σ = 30022716852. Its totient is φ = 10007572282.

The previous prime is 20015144543. The next prime is 20015144573. The reversal of 20015144566 is 66544151002.

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

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, 5003786140 + ... + 5003786143.

It is an arithmetic number, because the mean of its divisors is an integer number (7505679213).

Almost surely, 2^20015144566 is an apocalyptic number.

20015144566 is a deficient number, since it is larger than the sum of its proper divisors (10007572286).

20015144566 is a wasteful number, since it uses less digits than its factorization.

20015144566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10007572285.

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 20015144566 its reverse (66544151002), we get a palindrome (86559295568).

The spelling of 20015144566 in words is "twenty billion, fifteen million, one hundred forty-four thousand, five hundred sixty-six".