20101542 has 16 divisors (see below), whose sum is σ = 40247040. Its totient is φ = 6693192.

The previous prime is 20101537. The next prime is 20101559. The reversal of 20101542 is 24510102.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 9759 + ... + 11637.

It is an arithmetic number, because the mean of its divisors is an integer number (2515440).

Almost surely, 2^20101542 is an apocalyptic number.

20101542 is an abundant number, since it is smaller than the sum of its proper divisors (20145498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20101542 is a wasteful number, since it uses less digits than its factorization.

20101542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3667.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 20101542 is about 4483.4743224424. The cubic root of 20101542 is about 271.9003653966.

Adding to 20101542 its reverse (24510102), we get a palindrome (44611644).

The spelling of 20101542 in words is "twenty million, one hundred one thousand, five hundred forty-two".