20331542 has 48 divisors (see below), whose sum is σ = 39578112. Its totient is φ = 7606560.

The previous prime is 20331533. The next prime is 20331551. The reversal of 20331542 is 24513302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20331533) and next prime (20331551).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 383588 + ... + 383640.

It is an arithmetic number, because the mean of its divisors is an integer number (824544).

Almost surely, 2^20331542 is an apocalyptic number.

20331542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20331542 is a deficient number, since it is larger than the sum of its proper divisors (19246570).

20331542 is a wasteful number, since it uses less digits than its factorization.

20331542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20331542 is about 4509.0511196925. The cubic root of 20331542 is about 272.9334548679.

Adding to 20331542 its reverse (24513302), we get a palindrome (44844844).

The spelling of 20331542 in words is "twenty million, three hundred thirty-one thousand, five hundred forty-two".