20807407 has 2 divisors, whose sum is σ = 20807408. Its totient is φ = 20807406.

The previous prime is 20807393. The next prime is 20807443. The reversal of 20807407 is 70470802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20807407 - 2¹⁵ = 20774639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20807447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10403703 + 10403704.

It is an arithmetic number, because the mean of its divisors is an integer number (10403704).

Almost surely, 2^20807407 is an apocalyptic number.

20807407 is a deficient number, since it is larger than the sum of its proper divisors (1).

20807407 is an equidigital number, since it uses as much as digits as its factorization.

20807407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 20807407 is about 4561.5136742095. The cubic root of 20807407 is about 275.0464142044.

The spelling of 20807407 in words is "twenty million, eight hundred seven thousand, four hundred seven".