20670240 has 48 divisors (see below), whose sum is σ = 65112768. Its totient is φ = 5511936.

The previous prime is 20670217. The next prime is 20670241. The reversal of 20670240 is 4207602.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (20670241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21052 + ... + 22011.

It is an arithmetic number, because the mean of its divisors is an integer number (1356516).

Almost surely, 2^20670240 is an apocalyptic number.

20670240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20670240 is an abundant number, since it is smaller than the sum of its proper divisors (44442528).

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

20670240 is a wasteful number, since it uses less digits than its factorization.

20670240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43081 (or 43073 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20670240 is about 4546.4535629433. The cubic root of 20670240 is about 274.4406924270.

Adding to 20670240 its reverse (4207602), we get a palindrome (24877842).

It can be divided in two parts, 20670 and 240, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20670240 in words is "twenty million, six hundred seventy thousand, two hundred forty".