63700020 has 168 divisors, whose sum is σ = 213187464. Its totient is φ = 15925248.

The previous prime is 63700001. The next prime is 63700031. The reversal of 63700020 is 2000736.

It can be written as a sum of positive squares in 4 ways, for example, as 32764176 + 30935844 = 5724^2 + 5562^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 63699966 and 63700002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 247732 + ... + 247988.

It is an arithmetic number, because the mean of its divisors is an integer number (1268973).

Almost surely, 2^63700020 is an apocalyptic number.

63700020 is a gapful number since it is divisible by the number (60) 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 63700020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106593732).

63700020 is an abundant number, since it is smaller than the sum of its proper divisors (149487444).

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

63700020 is a wasteful number, since it uses less digits than its factorization.

63700020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 63700020 is about 7981.2292286339. The cubic root of 63700020 is about 399.3740626838.

Adding to 63700020 its reverse (2000736), we get a palindrome (65700756).

The spelling of 63700020 in words is "sixty-three million, seven hundred thousand, twenty".