20742813 has 96 divisors (see below), whose sum is σ = 41000960. Its totient is φ = 9797760.

The previous prime is 20742811. The next prime is 20742817. The reversal of 20742813 is 31824702.

It is not a de Polignac number, because 20742813 - 2¹ = 20742811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742811) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 482370 + ... + 482412.

Almost surely, 2^20742813 is an apocalyptic number.

It is an amenable number.

20742813 is a deficient number, since it is larger than the sum of its proper divisors (20258147).

20742813 is a wasteful number, since it uses less digits than its factorization.

20742813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20742813 is about 4554.4278455147. The cubic root of 20742813 is about 274.7615034140.

The spelling of 20742813 in words is "twenty million, seven hundred forty-two thousand, eight hundred thirteen".