40720820 has 48 divisors (see below), whose sum is σ = 98219520. Its totient is φ = 13891584.

The previous prime is 40720817. The next prime is 40720829. The reversal of 40720820 is 2802704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40720829) 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, 32852 + ... + 34068.

It is an arithmetic number, because the mean of its divisors is an integer number (2046240).

Almost surely, 2^40720820 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 40720820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49109760).

40720820 is an abundant number, since it is smaller than the sum of its proper divisors (57498700).

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

40720820 is a wasteful number, since it uses less digits than its factorization.

40720820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472 (or 1470 counting only the distinct ones).

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

The square root of 40720820 is about 6381.2867041060. The cubic root of 40720820 is about 344.0372796267.

The spelling of 40720820 in words is "forty million, seven hundred twenty thousand, eight hundred twenty".