20652213520 has 20 divisors (see below), whose sum is σ = 48016396620. Its totient is φ = 8260885376.

The previous prime is 20652213493. The next prime is 20652213539. The reversal of 20652213520 is 2531225602.

It can be written as a sum of positive squares in 2 ways, for example, as 14485566736 + 6166646784 = 120356^2 + 78528^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129076255 + ... + 129076414.

It is an arithmetic number, because the mean of its divisors is an integer number (2400819831).

Almost surely, 2^20652213520 is an apocalyptic number.

20652213520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20652213520 is an abundant number, since it is smaller than the sum of its proper divisors (27364183100).

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

20652213520 is a wasteful number, since it uses less digits than its factorization.

20652213520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258152682 (or 258152676 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 20652213520 in words is "twenty billion, six hundred fifty-two million, two hundred thirteen thousand, five hundred twenty".