20923459 has 2 divisors, whose sum is σ = 20923460. Its totient is φ = 20923458.

The previous prime is 20923429. The next prime is 20923493. The reversal of 20923459 is 95432902.

It is an a-pointer prime, because the next prime (20923493) can be obtained adding 20923459 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20923459 - 2⁹ = 20922947 is a prime.

It is a super-2 number, since 2×20923459² = 875582273049362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20923429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10461729 + 10461730.

It is an arithmetic number, because the mean of its divisors is an integer number (10461730).

Almost surely, 2^20923459 is an apocalyptic number.

20923459 is a deficient number, since it is larger than the sum of its proper divisors (1).

20923459 is an equidigital number, since it uses as much as digits as its factorization.

20923459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 20923459 is about 4574.2167635564. The cubic root of 20923459 is about 275.5568178043.

The spelling of 20923459 in words is "twenty million, nine hundred twenty-three thousand, four hundred fifty-nine".