4020690820 has 24 divisors (see below), whose sum is σ = 8527053528. Its totient is φ = 1592352000.

The previous prime is 4020690809. The next prime is 4020690829. The reversal of 4020690820 is 280960204.

It can be written as a sum of positive squares in 4 ways, for example, as 1152874116 + 2867816704 = 33954^2 + 53552^2 .

It is not an unprimeable number, because it can be changed into a prime (4020690829) 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, 993201 + ... + 997240.

It is an arithmetic number, because the mean of its divisors is an integer number (355293897).

Almost surely, 2^4020690820 is an apocalyptic number.

It is an amenable number.

4020690820 is an abundant number, since it is smaller than the sum of its proper divisors (4506362708).

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

4020690820 is a wasteful number, since it uses less digits than its factorization.

4020690820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990551 (or 1990549 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 4020690820 is about 63408.9175116560. The cubic root of 4020690820 is about 1590.1333986148.

The spelling of 4020690820 in words is "four billion, twenty million, six hundred ninety thousand, eight hundred twenty".