20213520135 has 32 divisors (see below), whose sum is σ = 33291793920. Its totient is φ = 10465158528.

The previous prime is 20213520073. The next prime is 20213520233. The reversal of 20213520135 is 53102531202.

It is a happy number.

It is not a de Polignac number, because 20213520135 - 2⁶ = 20213520071 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 202164 + ... + 285126.

It is an arithmetic number, because the mean of its divisors is an integer number (1040368560).

Almost surely, 2^20213520135 is an apocalyptic number.

20213520135 is a deficient number, since it is larger than the sum of its proper divisors (13078273785).

20213520135 is a wasteful number, since it uses less digits than its factorization.

20213520135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83447.

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 20213520135 in words is "twenty billion, two hundred thirteen million, five hundred twenty thousand, one hundred thirty-five".