20847403 has 2 divisors, whose sum is σ = 20847404. Its totient is φ = 20847402.

The previous prime is 20847401. The next prime is 20847419. The reversal of 20847403 is 30474802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20847403 - 2¹ = 20847401 is a prime.

It is a super-2 number, since 2×20847403² = 869228423688818, which contains 22 as substring.

Together with 20847401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20847401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10423701 + 10423702.

It is an arithmetic number, because the mean of its divisors is an integer number (10423702).

Almost surely, 2^20847403 is an apocalyptic number.

20847403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20847403 is an equidigital number, since it uses as much as digits as its factorization.

20847403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 20847403 is about 4565.8956405069. The cubic root of 20847403 is about 275.2225328232. Note that the first 3 decimals are identical.

The spelling of 20847403 in words is "twenty million, eight hundred forty-seven thousand, four hundred three".