20702335640 has 64 divisors (see below), whose sum is σ = 53542416960. Its totient is φ = 7056898560.

The previous prime is 20702335601. The next prime is 20702335679. The reversal of 20702335640 is 4653320702.

It is an interprime number because it is at equal distance from previous prime (20702335601) and next prime (20702335679).

It is a junction number, because it is equal to n+sod(n) for n = 20702335597 and 20702335606.

It is a congruent number.

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, 165251 + ... + 262130.

It is an arithmetic number, because the mean of its divisors is an integer number (836600265).

Almost surely, 2^20702335640 is an apocalyptic number.

20702335640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20702335640 is an abundant number, since it is smaller than the sum of its proper divisors (32840081320).

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

20702335640 is a wasteful number, since it uses less digits than its factorization.

20702335640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427572 (or 427568 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 32.

The spelling of 20702335640 in words is "twenty billion, seven hundred two million, three hundred thirty-five thousand, six hundred forty".