20201015542 has 4 divisors (see below), whose sum is σ = 30301523316. Its totient is φ = 10100507770.

The previous prime is 20201015539. The next prime is 20201015543. The reversal of 20201015542 is 24551010202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24551010202 = 2 ⋅12275505101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201015543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050253884 + ... + 5050253887.

It is an arithmetic number, because the mean of its divisors is an integer number (7575380829).

Almost surely, 2^20201015542 is an apocalyptic number.

20201015542 is a deficient number, since it is larger than the sum of its proper divisors (10100507774).

20201015542 is a wasteful number, since it uses less digits than its factorization.

20201015542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10100507773.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 20201015542 its reverse (24551010202), we get a palindrome (44752025744).

The spelling of 20201015542 in words is "twenty billion, two hundred one million, fifteen thousand, five hundred forty-two".