20648534 has 16 divisors (see below), whose sum is σ = 31505760. Its totient is φ = 10148160.

The previous prime is 20648531. The next prime is 20648581. The reversal of 20648534 is 43584602.

It is a self number, because there is not a number n which added to its sum of digits gives 20648534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20648531) 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, 55172 + ... + 55544.

It is an arithmetic number, because the mean of its divisors is an integer number (1969110).

Almost surely, 2^20648534 is an apocalyptic number.

20648534 is a deficient number, since it is larger than the sum of its proper divisors (10857226).

20648534 is a wasteful number, since it uses less digits than its factorization.

20648534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 20648534 is about 4544.0658005799. The cubic root of 20648534 is about 274.3445945901.

The spelling of 20648534 in words is "twenty million, six hundred forty-eight thousand, five hundred thirty-four".