20742080 has 56 divisors (see below), whose sum is σ = 50365152. Its totient is φ = 8133632.

The previous prime is 20742077. The next prime is 20742083. The reversal of 20742080 is 8024702.

It is an interprime number because it is at equal distance from previous prime (20742077) and next prime (20742083).

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16349 + ... + 17571.

Almost surely, 2^20742080 is an apocalyptic number.

20742080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20742080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25182576).

20742080 is an abundant number, since it is smaller than the sum of its proper divisors (29623072).

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

20742080 is a wasteful number, since it uses less digits than its factorization.

20742080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293 (or 1283 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 20742080 is about 4554.3473736640. The cubic root of 20742080 is about 274.7582669106.

Adding to 20742080 its reverse (8024702), we get a palindrome (28766782).

The spelling of 20742080 in words is "twenty million, seven hundred forty-two thousand, eighty".