20124742 has 16 divisors (see below), whose sum is σ = 33633792. Its totient is φ = 8952520.

The previous prime is 20124733. The next prime is 20124757. The reversal of 20124742 is 24742102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8698 + ... + 10765.

It is an arithmetic number, because the mean of its divisors is an integer number (2102112).

Almost surely, 2^20124742 is an apocalyptic number.

20124742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20124742 is a deficient number, since it is larger than the sum of its proper divisors (13509050).

20124742 is a wasteful number, since it uses less digits than its factorization.

20124742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19523.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 20124742 is about 4486.0608555837. The cubic root of 20124742 is about 272.0049289043.

Adding to 20124742 its reverse (24742102), we get a palindrome (44866844).

The spelling of 20124742 in words is "twenty million, one hundred twenty-four thousand, seven hundred forty-two".