20013240 has 64 divisors (see below), whose sum is σ = 64663200. Its totient is φ = 4925952.

The previous prime is 20013239. The next prime is 20013241. The reversal of 20013240 is 4231002.

20013240 = T₇₅₂ + T₇₅₃ + ... + T₈₁₆.

It is an interprime number because it is at equal distance from previous prime (20013239) and next prime (20013241).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4855 + ... + 7974.

Almost surely, 2^20013240 is an apocalyptic number.

20013240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20013240 is an abundant number, since it is smaller than the sum of its proper divisors (44649960).

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

20013240 is a wasteful number, since it uses less digits than its factorization.

20013240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12856 (or 12852 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20013240 is about 4473.6159870959. The cubic root of 20013240 is about 271.5016465956.

Adding to 20013240 its reverse (4231002), we get a palindrome (24244242).

The spelling of 20013240 in words is "twenty million, thirteen thousand, two hundred forty".