20739213 has 16 divisors (see below), whose sum is σ = 33518400. Its totient is φ = 12569040.

The previous prime is 20739211. The next prime is 20739233. The reversal of 20739213 is 31293702.

It is not a de Polignac number, because 20739213 - 2¹ = 20739211 is a prime.

It is a super-2 number, since 2×20739213² = 860229911718738, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20739211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34618 + ... + 35211.

It is an arithmetic number, because the mean of its divisors is an integer number (2094900).

Almost surely, 2^20739213 is an apocalyptic number.

It is an amenable number.

20739213 is a deficient number, since it is larger than the sum of its proper divisors (12779187).

20739213 is a wasteful number, since it uses less digits than its factorization.

20739213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69849 (or 69843 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 20739213 is about 4554.0326085789. The cubic root of 20739213 is about 274.7456071669.

The spelling of 20739213 in words is "twenty million, seven hundred thirty-nine thousand, two hundred thirteen".