20973679 has 2 divisors, whose sum is σ = 20973680. Its totient is φ = 20973678.

The previous prime is 20973653. The next prime is 20973731. The reversal of 20973679 is 97637902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20973679 - 2¹³ = 20965487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20973179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10486839 + 10486840.

It is an arithmetic number, because the mean of its divisors is an integer number (10486840).

Almost surely, 2^20973679 is an apocalyptic number.

20973679 is a deficient number, since it is larger than the sum of its proper divisors (1).

20973679 is an equidigital number, since it uses as much as digits as its factorization.

20973679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 142884, while the sum is 43.

The square root of 20973679 is about 4579.7029379644. The cubic root of 20973679 is about 275.7771033467. Note that the first 3 decimals are identical.

It can be divided in two parts, 2097 and 3679, that added together give a square (5776 = 76²).

The spelling of 20973679 in words is "twenty million, nine hundred seventy-three thousand, six hundred seventy-nine".