20460720 has 160 divisors (see below), whose sum is σ = 76423680. Its totient is φ = 4423680.

The previous prime is 20460697. The next prime is 20460721. The reversal of 20460720 is 2706402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20460721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31600 + ... + 32240.

It is an arithmetic number, because the mean of its divisors is an integer number (477648).

Almost surely, 2^20460720 is an apocalyptic number.

20460720 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 20460720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38211840).

20460720 is an abundant number, since it is smaller than the sum of its proper divisors (55962960).

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

20460720 is a wasteful number, since it uses less digits than its factorization.

20460720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683 (or 677 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20460720 is about 4523.3527388432. The cubic root of 20460720 is about 273.5102694704.

The spelling of 20460720 in words is "twenty million, four hundred sixty thousand, seven hundred twenty".