20669754 has 64 divisors (see below), whose sum is σ = 49729536. Its totient is φ = 5603904.

The previous prime is 20669729. The next prime is 20669767. The reversal of 20669754 is 45796602.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72897 + ... + 73179.

It is an arithmetic number, because the mean of its divisors is an integer number (777024).

Almost surely, 2^20669754 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20669754, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24864768).

20669754 is an abundant number, since it is smaller than the sum of its proper divisors (29059782).

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

20669754 is a wasteful number, since it uses less digits than its factorization.

20669754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 20669754 is about 4546.4001143762. The cubic root of 20669754 is about 274.4385415211.

The spelling of 20669754 in words is "twenty million, six hundred sixty-nine thousand, seven hundred fifty-four".