20957218422538 has 32 divisors (see below), whose sum is σ = 32209759991808. Its totient is φ = 10223889984000.

The previous prime is 20957218422533. The next prime is 20957218422541. The reversal of 20957218422538 is 83522481275902.

It is a super-2 number, since 2×20957218422538² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20957218422533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9203298 + ... + 11252338.

It is an arithmetic number, because the mean of its divisors is an integer number (1006554999744).

Almost surely, 2^{20957218422538} is an apocalyptic number.

20957218422538 is a deficient number, since it is larger than the sum of its proper divisors (11252541569270).

20957218422538 is a wasteful number, since it uses less digits than its factorization.

20957218422538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2049838.

The product of its (nonzero) digits is 19353600, while the sum is 58.

The spelling of 20957218422538 in words is "twenty trillion, nine hundred fifty-seven billion, two hundred eighteen million, four hundred twenty-two thousand, five hundred thirty-eight".