20747040 has 48 divisors (see below), whose sum is σ = 65354688. Its totient is φ = 5532416.

The previous prime is 20747011. The next prime is 20747053. The reversal of 20747040 is 4074702.

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

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20747040.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21132 + ... + 22091.

It is an arithmetic number, because the mean of its divisors is an integer number (1361556).

Almost surely, 2^20747040 is an apocalyptic number.

20747040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20747040 is an abundant number, since it is smaller than the sum of its proper divisors (44607648).

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

20747040 is a wasteful number, since it uses less digits than its factorization.

20747040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43241 (or 43233 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 24.

The square root of 20747040 is about 4554.8918757749. The cubic root of 20747040 is about 274.7801659100.

The spelling of 20747040 in words is "twenty million, seven hundred forty-seven thousand, forty".