20770747 has 2 divisors, whose sum is σ = 20770748. Its totient is φ = 20770746.

The previous prime is 20770741. The next prime is 20770777. The reversal of 20770747 is 74707702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20770747 - 2⁷ = 20770619 is a prime.

It is not a weakly prime, because it can be changed into another prime (20770741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10385373 + 10385374.

It is an arithmetic number, because the mean of its divisors is an integer number (10385374).

Almost surely, 2^20770747 is an apocalyptic number.

20770747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20770747 is an equidigital number, since it uses as much as digits as its factorization.

20770747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19208, while the sum is 34.

The square root of 20770747 is about 4557.4934997211. The cubic root of 20770747 is about 274.8847869992.

The spelling of 20770747 in words is "twenty million, seven hundred seventy thousand, seven hundred forty-seven".