20513632550 has 24 divisors (see below), whose sum is σ = 38279669736. Its totient is φ = 8178719040.

The previous prime is 20513632547. The next prime is 20513632553. The reversal of 20513632550 is 5523631502.

It is an interprime number because it is at equal distance from previous prime (20513632547) and next prime (20513632553).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513632553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 652847 + ... + 683546.

It is an arithmetic number, because the mean of its divisors is an integer number (1594986239).

Almost surely, 2^20513632550 is an apocalyptic number.

20513632550 is a deficient number, since it is larger than the sum of its proper divisors (17766037186).

20513632550 is a wasteful number, since it uses less digits than its factorization.

20513632550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336712 (or 1336707 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 32.

The spelling of 20513632550 in words is "twenty billion, five hundred thirteen million, six hundred thirty-two thousand, five hundred fifty".