20766654 has 48 divisors (see below), whose sum is σ = 47503872. Its totient is φ = 6543504.

The previous prime is 20766653. The next prime is 20766661. The reversal of 20766654 is 45666702.

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 not an unprimeable number, because it can be changed into a prime (20766653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42399 + ... + 42885.

It is an arithmetic number, because the mean of its divisors is an integer number (989664).

Almost surely, 2^20766654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20766654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23751936).

20766654 is an abundant number, since it is smaller than the sum of its proper divisors (26737218).

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

20766654 is a wasteful number, since it uses less digits than its factorization.

20766654 is an evil number, because the sum of its binary digits is even.

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

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 20766654 is about 4557.0444369130. The cubic root of 20766654 is about 274.8667299156.

The spelling of 20766654 in words is "twenty million, seven hundred sixty-six thousand, six hundred fifty-four".