20999612 has 6 divisors (see below), whose sum is σ = 36749328. Its totient is φ = 10499804.

The previous prime is 20999597. The next prime is 20999623. The reversal of 20999612 is 21699902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2624948 + ... + 2624955.

It is an arithmetic number, because the mean of its divisors is an integer number (6124888).

Almost surely, 2^20999612 is an apocalyptic number.

It is an amenable number.

20999612 is a deficient number, since it is larger than the sum of its proper divisors (15749716).

20999612 is a wasteful number, since it uses less digits than its factorization.

20999612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5249907 (or 5249905 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 20999612 is about 4582.5333604896. The cubic root of 20999612 is about 275.8907184807.

It can be divided in two parts, 2099 and 9612, that added together give a palindrome (11711).

The spelling of 20999612 in words is "twenty million, nine hundred ninety-nine thousand, six hundred twelve".