20734668 has 18 divisors (see below), whose sum is σ = 52412724. Its totient is φ = 6911544.

The previous prime is 20734667. The next prime is 20734669. The reversal of 20734668 is 86643702.

It is an interprime number because it is at equal distance from previous prime (20734667) and next prime (20734669).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 575963 = 20734668 / (2 + 0 + 7 + 3 + 4 + 6 + 6 + 8).

It is not an unprimeable number, because it can be changed into a prime (20734663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 287946 + ... + 288017.

It is an arithmetic number, because the mean of its divisors is an integer number (2911818).

Almost surely, 2^20734668 is an apocalyptic number.

It is an amenable number.

20734668 is an abundant number, since it is smaller than the sum of its proper divisors (31678056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20734668 is a wasteful number, since it uses less digits than its factorization.

20734668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575973 (or 575968 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 20734668 is about 4553.5335729519. The cubic root of 20734668 is about 274.7255355275.

The spelling of 20734668 in words is "twenty million, seven hundred thirty-four thousand, six hundred sixty-eight".