20091654 has 96 divisors (see below), whose sum is σ = 51757056. Its totient is φ = 5564160.

The previous prime is 20091649. The next prime is 20091667. The reversal of 20091654 is 45619002.

20091654 is a `hidden beast` number, since 2 + 0 + 0 + 9 + 1 + 654 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 158139 + ... + 158265.

It is an arithmetic number, because the mean of its divisors is an integer number (539136).

Almost surely, 2^20091654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20091654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25878528).

20091654 is an abundant number, since it is smaller than the sum of its proper divisors (31665402).

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

20091654 is a wasteful number, since it uses less digits than its factorization.

20091654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20091654 is about 4482.3714705499. The cubic root of 20091654 is about 271.8557752558.

It can be divided in two parts, 2009 and 1654, that added together give a palindrome (3663).

The spelling of 20091654 in words is "twenty million, ninety-one thousand, six hundred fifty-four".