20663742 has 16 divisors (see below), whose sum is σ = 45084672. Its totient is φ = 6261720.

The previous prime is 20663737. The next prime is 20663759. The reversal of 20663742 is 24736602.

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, 156478 + ... + 156609.

It is an arithmetic number, because the mean of its divisors is an integer number (2817792).

Almost surely, 2^20663742 is an apocalyptic number.

20663742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20663742 is an abundant number, since it is smaller than the sum of its proper divisors (24420930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20663742 is a wasteful number, since it uses less digits than its factorization.

20663742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313103.

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 20663742 is about 4545.7388838340. The cubic root of 20663742 is about 274.4119312302.

The spelling of 20663742 in words is "twenty million, six hundred sixty-three thousand, seven hundred forty-two".