20650215720 has 64 divisors (see below), whose sum is σ = 62330771520. Its totient is φ = 5472935424.

The previous prime is 20650215713. The next prime is 20650215737. The reversal of 20650215720 is 2751205602.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 508309 + ... + 547428.

It is an arithmetic number, because the mean of its divisors is an integer number (973918305).

Almost surely, 2^20650215720 is an apocalyptic number.

20650215720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20650215720 is an abundant number, since it is smaller than the sum of its proper divisors (41680555800).

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

20650215720 is a wasteful number, since it uses less digits than its factorization.

20650215720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055914 (or 1055910 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

It can be divided in two parts, 206502 and 15720, that added together give a palindrome (222222).

The spelling of 20650215720 in words is "twenty billion, six hundred fifty million, two hundred fifteen thousand, seven hundred twenty".