20920064 has 144 divisors (see below), whose sum is σ = 52980480. Its totient is φ = 8110080.

The previous prime is 20920061. The next prime is 20920091. The reversal of 20920064 is 46002902.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20920061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 909557 + ... + 909579.

It is an arithmetic number, because the mean of its divisors is an integer number (367920).

Almost surely, 2^20920064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20920064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26490240).

20920064 is an abundant number, since it is smaller than the sum of its proper divisors (32060416).

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

20920064 is a wasteful number, since it uses less digits than its factorization.

20920064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20920064 is about 4573.8456467179. The cubic root of 20920064 is about 275.5419132260.

Adding to 20920064 its reverse (46002902), we get a palindrome (66922966).

The spelling of 20920064 in words is "twenty million, nine hundred twenty thousand, sixty-four".