20739654 has 48 divisors (see below), whose sum is σ = 48720672. Its totient is φ = 6338304.

The previous prime is 20739619. The next prime is 20739661. The reversal of 20739654 is 45693702.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 23 ways as a sum of consecutive naturals, for example, 61374 + ... + 61710.

It is an arithmetic number, because the mean of its divisors is an integer number (1015014).

Almost surely, 2^20739654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20739654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24360336).

20739654 is an abundant number, since it is smaller than the sum of its proper divisors (27981018).

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

20739654 is a wasteful number, since it uses less digits than its factorization.

20739654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 20739654 is about 4554.0810269471. The cubic root of 20739654 is about 274.7475545561.

The spelling of 20739654 in words is "twenty million, seven hundred thirty-nine thousand, six hundred fifty-four".