20742104 has 8 divisors (see below), whose sum is σ = 38891460. Its totient is φ = 10371048.

The previous prime is 20742103. The next prime is 20742109. The reversal of 20742104 is 40124702.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1296374 + ... + 1296389.

Almost surely, 2^20742104 is an apocalyptic number.

It is an amenable number.

20742104 is a deficient number, since it is larger than the sum of its proper divisors (18149356).

20742104 is a wasteful number, since it uses less digits than its factorization.

20742104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2592769 (or 2592765 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 20742104 is about 4554.3500085083. The cubic root of 20742104 is about 274.7583728819.

Adding to 20742104 its reverse (40124702), we get a palindrome (60866806).

The spelling of 20742104 in words is "twenty million, seven hundred forty-two thousand, one hundred four".