651402020 has 48 divisors (see below), whose sum is σ = 1412504688. Its totient is φ = 252149760.

The previous prime is 651402013. The next prime is 651402029. The reversal of 651402020 is 20204156.

It is a happy number.

651402020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 2579236 + 648822784 = 1606^2 + 25472^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 651401983 and 651402001.

It is not an unprimeable number, because it can be changed into a prime (651402029) 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, 140540 + ... + 145100.

It is an arithmetic number, because the mean of its divisors is an integer number (29427181).

Almost surely, 2^651402020 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 651402020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (706252344).

651402020 is an abundant number, since it is smaller than the sum of its proper divisors (761102668).

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

651402020 is a wasteful number, since it uses less digits than its factorization.

651402020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4800 (or 4798 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 651402020 is about 25522.5786314784. The cubic root of 651402020 is about 866.8614706740.

Adding to 651402020 its reverse (20204156), we get a palindrome (671606176).

The spelling of 651402020 in words is "six hundred fifty-one million, four hundred two thousand, twenty".