20350639 has 2 divisors, whose sum is σ = 20350640. Its totient is φ = 20350638.

The previous prime is 20350621. The next prime is 20350643. The reversal of 20350639 is 93605302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20350639 - 2¹³ = 20342447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20350609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10175319 + 10175320.

It is an arithmetic number, because the mean of its divisors is an integer number (10175320).

Almost surely, 2^20350639 is an apocalyptic number.

20350639 is a deficient number, since it is larger than the sum of its proper divisors (1).

20350639 is an equidigital number, since it uses as much as digits as its factorization.

20350639 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 28.

The square root of 20350639 is about 4511.1682522380. The cubic root of 20350639 is about 273.0188817239.

The spelling of 20350639 in words is "twenty million, three hundred fifty thousand, six hundred thirty-nine".