20439626 has 4 divisors (see below), whose sum is σ = 30659442. Its totient is φ = 10219812.

The previous prime is 20439619. The next prime is 20439641. The reversal of 20439626 is 62693402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62693402 = 2 ⋅31346701.

It can be written as a sum of positive squares in only one way, i.e., 20259001 + 180625 = 4501^2 + 425^2 .

It is a super-2 number, since 2×20439626² = 835556622039752, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20439592 and 20439601.

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, 5109905 + ... + 5109908.

Almost surely, 2^20439626 is an apocalyptic number.

20439626 is a deficient number, since it is larger than the sum of its proper divisors (10219816).

20439626 is a wasteful number, since it uses less digits than its factorization.

20439626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10219815.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 20439626 is about 4521.0204600289. The cubic root of 20439626 is about 273.4162452551.

The spelling of 20439626 in words is "twenty million, four hundred thirty-nine thousand, six hundred twenty-six".