20740648 has 8 divisors (see below), whose sum is σ = 38888730. Its totient is φ = 10370320.

The previous prime is 20740633. The next prime is 20740673. The reversal of 20740648 is 84604702.

It can be written as a sum of positive squares in only one way, i.e., 17123044 + 3617604 = 4138^2 + 1902^2 .

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

It is a super-3 number, since 3×20740648³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1296283 + ... + 1296298.

Almost surely, 2^20740648 is an apocalyptic number.

It is an amenable number.

20740648 is a deficient number, since it is larger than the sum of its proper divisors (18148082).

20740648 is a wasteful number, since it uses less digits than its factorization.

20740648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2592587 (or 2592583 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 20740648 is about 4554.1901585243. The cubic root of 20740648 is about 274.7519438081.

It can be divided in two parts, 20740 and 648, that multiplied together give a triangular number (13439520 = T₅₁₈₄).

The spelling of 20740648 in words is "twenty million, seven hundred forty thousand, six hundred forty-eight".