20002740 has 48 divisors (see below), whose sum is σ = 57317568. Its totient is φ = 5209344.

The previous prime is 20002739. The next prime is 20002757. The reversal of 20002740 is 4720002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1297 + ... + 6456.

It is an arithmetic number, because the mean of its divisors is an integer number (1194116).

Almost surely, 2^20002740 is an apocalyptic number.

20002740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20002740 is an abundant number, since it is smaller than the sum of its proper divisors (37314828).

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

20002740 is a wasteful number, since it uses less digits than its factorization.

20002740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7808 (or 7806 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 15.

The square root of 20002740 is about 4472.4422858210. The cubic root of 20002740 is about 271.4541569339.

Adding to 20002740 its reverse (4720002), we get a palindrome (24722742).

The spelling of 20002740 in words is "twenty million, two thousand, seven hundred forty".