220340977 has 2 divisors, whose sum is σ = 220340978. Its totient is φ = 220340976.

The previous prime is 220340947. The next prime is 220340983. The reversal of 220340977 is 779043022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203889841 + 16451136 = 14279^2 + 4056^2 .

It is a cyclic number.

It is not a de Polignac number, because 220340977 - 2⁷ = 220340849 is a prime.

It is a super-2 number, since 2×220340977² = 97100292290629058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (220340947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110170488 + 110170489.

It is an arithmetic number, because the mean of its divisors is an integer number (110170489).

Almost surely, 2^220340977 is an apocalyptic number.

It is an amenable number.

220340977 is a deficient number, since it is larger than the sum of its proper divisors (1).

220340977 is an equidigital number, since it uses as much as digits as its factorization.

220340977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 220340977 is about 14843.8868562112. The cubic root of 220340977 is about 603.9927935415.

Adding to 220340977 its reverse (779043022), we get a palindrome (999383999).

The spelling of 220340977 in words is "two hundred twenty million, three hundred forty thousand, nine hundred seventy-seven".