20742608 has 10 divisors (see below), whose sum is σ = 40188834. Its totient is φ = 10371296.

The previous prime is 20742593. The next prime is 20742637. The reversal of 20742608 is 80624702.

It can be written as a sum of positive squares in only one way, i.e., 20720704 + 21904 = 4552^2 + 148^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648191 + ... + 648222.

Almost surely, 2^20742608 is an apocalyptic number.

It is an amenable number.

20742608 is a deficient number, since it is larger than the sum of its proper divisors (19446226).

20742608 is a wasteful number, since it uses less digits than its factorization.

20742608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296421 (or 1296415 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20742608 is about 4554.4053398880. The cubic root of 20742608 is about 274.7605982604.

The spelling of 20742608 in words is "twenty million, seven hundred forty-two thousand, six hundred eight".