20438648 has 8 divisors (see below), whose sum is σ = 38322480. Its totient is φ = 10219320.

The previous prime is 20438633. The next prime is 20438659. The reversal of 20438648 is 84683402.

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

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, 1277408 + ... + 1277423.

It is an arithmetic number, because the mean of its divisors is an integer number (4790310).

Almost surely, 2^20438648 is an apocalyptic number.

It is an amenable number.

20438648 is a deficient number, since it is larger than the sum of its proper divisors (17883832).

20438648 is a wasteful number, since it uses less digits than its factorization.

20438648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554837 (or 2554833 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 20438648 is about 4520.9122973135. The cubic root of 20438648 is about 273.4118843574.

The spelling of 20438648 in words is "twenty million, four hundred thirty-eight thousand, six hundred forty-eight".