20879633 has 2 divisors, whose sum is σ = 20879634. Its totient is φ = 20879632.

The previous prime is 20879627. The next prime is 20879707. The reversal of 20879633 is 33697802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14569489 + 6310144 = 3817^2 + 2512^2 .

It is a cyclic number.

It is not a de Polignac number, because 20879633 - 2¹⁰ = 20878609 is a prime.

It is not a weakly prime, because it can be changed into another prime (20879603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10439816 + 10439817.

It is an arithmetic number, because the mean of its divisors is an integer number (10439817).

Almost surely, 2^20879633 is an apocalyptic number.

It is an amenable number.

20879633 is a deficient number, since it is larger than the sum of its proper divisors (1).

20879633 is an equidigital number, since it uses as much as digits as its factorization.

20879633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 20879633 is about 4569.4237054578. The cubic root of 20879633 is about 275.3642907669.

It can be divided in two parts, 20879 and 633, that added together give a palindrome (21512).

The spelling of 20879633 in words is "twenty million, eight hundred seventy-nine thousand, six hundred thirty-three".