20946451 has 2 divisors, whose sum is σ = 20946452. Its totient is φ = 20946450.

The previous prime is 20946433. The next prime is 20946473. The reversal of 20946451 is 15464902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20946451 - 2¹³ = 20938259 is a prime.

It is not a weakly prime, because it can be changed into another prime (20946481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10473225 + 10473226.

It is an arithmetic number, because the mean of its divisors is an integer number (10473226).

Almost surely, 2^20946451 is an apocalyptic number.

20946451 is a deficient number, since it is larger than the sum of its proper divisors (1).

20946451 is an equidigital number, since it uses as much as digits as its factorization.

20946451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20946451 is about 4576.7292906616. The cubic root of 20946451 is about 275.6577138547.

The spelling of 20946451 in words is "twenty million, nine hundred forty-six thousand, four hundred fifty-one".