20246977 has 2 divisors, whose sum is σ = 20246978. Its totient is φ = 20246976.

The previous prime is 20246953. The next prime is 20246987. The reversal of 20246977 is 77964202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18284176 + 1962801 = 4276^2 + 1401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20246977 is a prime.

It is not a weakly prime, because it can be changed into another prime (20246917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10123488 + 10123489.

It is an arithmetic number, because the mean of its divisors is an integer number (10123489).

Almost surely, 2^20246977 is an apocalyptic number.

It is an amenable number.

20246977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20246977 is an equidigital number, since it uses as much as digits as its factorization.

20246977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 20246977 is about 4499.6640985745. The cubic root of 20246977 is about 272.5545249028.

The spelling of 20246977 in words is "twenty million, two hundred forty-six thousand, nine hundred seventy-seven".