20219677 has 2 divisors, whose sum is σ = 20219678. Its totient is φ = 20219676.

The previous prime is 20219671. The next prime is 20219687. The reversal of 20219677 is 77691202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20124196 + 95481 = 4486^2 + 309^2 .

It is a cyclic number.

It is not a de Polignac number, because 20219677 - 2³ = 20219669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20219671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10109838 + 10109839.

It is an arithmetic number, because the mean of its divisors is an integer number (10109839).

Almost surely, 2^20219677 is an apocalyptic number.

It is an amenable number.

20219677 is a deficient number, since it is larger than the sum of its proper divisors (1).

20219677 is an equidigital number, since it uses as much as digits as its factorization.

20219677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 20219677 is about 4496.6295155372. The cubic root of 20219677 is about 272.4319702242.

The spelling of 20219677 in words is "twenty million, two hundred nineteen thousand, six hundred seventy-seven".