20506744 has 8 divisors (see below), whose sum is σ = 38450160. Its totient is φ = 10253368.

The previous prime is 20506729. The next prime is 20506747. The reversal of 20506744 is 44760502.

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

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1281664 + ... + 1281679.

It is an arithmetic number, because the mean of its divisors is an integer number (4806270).

Almost surely, 2^20506744 is an apocalyptic number.

It is an amenable number.

20506744 is a deficient number, since it is larger than the sum of its proper divisors (17943416).

20506744 is a wasteful number, since it uses less digits than its factorization.

20506744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563349 (or 2563345 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 20506744 is about 4528.4372580395. The cubic root of 20506744 is about 273.7151923662.

The spelling of 20506744 in words is "twenty million, five hundred six thousand, seven hundred forty-four".