20870743 has 2 divisors, whose sum is σ = 20870744. Its totient is φ = 20870742.

The previous prime is 20870693. The next prime is 20870753. The reversal of 20870743 is 34707802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20870743 - 2⁹ = 20870231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20870753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10435371 + 10435372.

It is an arithmetic number, because the mean of its divisors is an integer number (10435372).

Almost surely, 2^20870743 is an apocalyptic number.

20870743 is a deficient number, since it is larger than the sum of its proper divisors (1).

20870743 is an equidigital number, since it uses as much as digits as its factorization.

20870743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 20870743 is about 4568.4508315183. The cubic root of 20870743 is about 275.3252042553.

The spelling of 20870743 in words is "twenty million, eight hundred seventy thousand, seven hundred forty-three".