20739226 has 4 divisors (see below), whose sum is σ = 31108842. Its totient is φ = 10369612.

The previous prime is 20739211. The next prime is 20739233. The reversal of 20739226 is 62293702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62293702 = 2 ⋅31146851.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 2719201 = 4245^2 + 1649^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5184805 + ... + 5184808.

Almost surely, 2^20739226 is an apocalyptic number.

20739226 is a deficient number, since it is larger than the sum of its proper divisors (10369616).

20739226 is a wasteful number, since it uses less digits than its factorization.

20739226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10369615.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 20739226 is about 4554.0340358851. The cubic root of 20739226 is about 274.7456645734.

The spelling of 20739226 in words is "twenty million, seven hundred thirty-nine thousand, two hundred twenty-six".