20306738 has 32 divisors (see below), whose sum is σ = 33592320. Its totient is φ = 9168640.

The previous prime is 20306731. The next prime is 20306749. The reversal of 20306738 is 83760302.

It is a self number, because there is not a number n which added to its sum of digits gives 20306738.

It is not an unprimeable number, because it can be changed into a prime (20306731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106223 + ... + 106413.

It is an arithmetic number, because the mean of its divisors is an integer number (1049760).

Almost surely, 2^20306738 is an apocalyptic number.

20306738 is a deficient number, since it is larger than the sum of its proper divisors (13285582).

20306738 is a wasteful number, since it uses less digits than its factorization.

20306738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20306738 is about 4506.2998124847. The cubic root of 20306738 is about 272.8224189170.

The spelling of 20306738 in words is "twenty million, three hundred six thousand, seven hundred thirty-eight".