20213959 has 2 divisors, whose sum is σ = 20213960. Its totient is φ = 20213958.

The previous prime is 20213923. The next prime is 20213981. The reversal of 20213959 is 95931202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20213959 - 2¹³ = 20205767 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20213959.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20213059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106979 + 10106980.

It is an arithmetic number, because the mean of its divisors is an integer number (10106980).

Almost surely, 2^20213959 is an apocalyptic number.

20213959 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213959 is an equidigital number, since it uses as much as digits as its factorization.

20213959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 20213959 is about 4495.9936610276. The cubic root of 20213959 is about 272.4062871092.

It can be divided in two parts, 202 and 13959, that added together give a square (14161 = 119²).

The spelling of 20213959 in words is "twenty million, two hundred thirteen thousand, nine hundred fifty-nine".