20340651720 has 64 divisors (see below), whose sum is σ = 61206431040. Its totient is φ = 5407776000.

The previous prime is 20340651713. The next prime is 20340651757. The reversal of 20340651720 is 2715604302.

It is a super-2 number, since 2×20340651720² (a number of 21 digits) contains 22 as substring.

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, 216331 + ... + 295770.

It is an arithmetic number, because the mean of its divisors is an integer number (956350485).

Almost surely, 2^20340651720 is an apocalyptic number.

20340651720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20340651720 is an abundant number, since it is smaller than the sum of its proper divisors (40865779320).

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

20340651720 is a wasteful number, since it uses less digits than its factorization.

20340651720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512446 (or 512442 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The spelling of 20340651720 in words is "twenty billion, three hundred forty million, six hundred fifty-one thousand, seven hundred twenty".