20613740 has 48 divisors (see below), whose sum is σ = 50175552. Its totient is φ = 6967296.

The previous prime is 20613737. The next prime is 20613781. The reversal of 20613740 is 4731602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9212 + ... + 11228.

It is an arithmetic number, because the mean of its divisors is an integer number (1045324).

Almost surely, 2^20613740 is an apocalyptic number.

20613740 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 20613740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25087776).

20613740 is an abundant number, since it is smaller than the sum of its proper divisors (29561812).

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

20613740 is a wasteful number, since it uses less digits than its factorization.

20613740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106 (or 2104 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 20613740 is about 4540.2356767023. The cubic root of 20613740 is about 274.1904123375.

The spelling of 20613740 in words is "twenty million, six hundred thirteen thousand, seven hundred forty".