20945384 has 8 divisors (see below), whose sum is σ = 39272610. Its totient is φ = 10472688.

The previous prime is 20945369. The next prime is 20945399. The reversal of 20945384 is 48354902.

It is an interprime number because it is at equal distance from previous prime (20945369) and next prime (20945399).

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 605284 = 4510^2 + 778^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×20945384² = 877418221814912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1309079 + ... + 1309094.

Almost surely, 2^20945384 is an apocalyptic number.

It is an amenable number.

20945384 is a deficient number, since it is larger than the sum of its proper divisors (18327226).

20945384 is a wasteful number, since it uses less digits than its factorization.

20945384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2618179 (or 2618175 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20945384 is about 4576.6127212164. The cubic root of 20945384 is about 275.6530331608.

The spelling of 20945384 in words is "twenty million, nine hundred forty-five thousand, three hundred eighty-four".