20542641 has 16 divisors (see below), whose sum is σ = 31895424. Its totient is φ = 11516544.

The previous prime is 20542633. The next prime is 20542649. The reversal of 20542641 is 14624502.

It is an interprime number because it is at equal distance from previous prime (20542633) and next prime (20542649).

It is not a de Polignac number, because 20542641 - 2³ = 20542633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20542649) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8116 + ... + 10341.

It is an arithmetic number, because the mean of its divisors is an integer number (1993464).

Almost surely, 2^20542641 is an apocalyptic number.

20542641 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20542641 is a deficient number, since it is larger than the sum of its proper divisors (11352783).

20542641 is a wasteful number, since it uses less digits than its factorization.

20542641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18520.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20542641 is about 4532.3990336245. The cubic root of 20542641 is about 273.8748118330.

The spelling of 20542641 in words is "twenty million, five hundred forty-two thousand, six hundred forty-one".