20870739 has 12 divisors (see below), whose sum is σ = 30211272. Its totient is φ = 13884000.

The previous prime is 20870693. The next prime is 20870743. The reversal of 20870739 is 93707802.

It is not a de Polignac number, because 20870739 - 2¹⁹ = 20346451 is a prime.

It is a super-2 number, since 2×20870739² = 871175492812242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20870779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2464 + ... + 6914.

It is an arithmetic number, because the mean of its divisors is an integer number (2517606).

Almost surely, 2^20870739 is an apocalyptic number.

20870739 is a deficient number, since it is larger than the sum of its proper divisors (9340533).

20870739 is a wasteful number, since it uses less digits than its factorization.

20870739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4978 (or 4975 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 20870739 is about 4568.4503937331. The cubic root of 20870739 is about 275.3251866660.

It can be divided in two parts, 20870 and 739, that added together give a square (21609 = 147²).

The spelling of 20870739 in words is "twenty million, eight hundred seventy thousand, seven hundred thirty-nine".