20257255921934 has 16 divisors (see below), whose sum is σ = 30442496157360. Its totient is φ = 10109757752640.

The previous prime is 20257255921933. The next prime is 20257255921937. The reversal of 20257255921934 is 43912955275202.

It is a super-2 number, since 2×20257255921934² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20257255921934.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20257255921933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137653157 + ... + 137800239.

It is an arithmetic number, because the mean of its divisors is an integer number (1902656009835).

Almost surely, 2^{20257255921934} is an apocalyptic number.

20257255921934 is a deficient number, since it is larger than the sum of its proper divisors (10185240235426).

20257255921934 is a wasteful number, since it uses less digits than its factorization.

20257255921934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274915.

The product of its (nonzero) digits is 13608000, while the sum is 56.

The spelling of 20257255921934 in words is "twenty trillion, two hundred fifty-seven billion, two hundred fifty-five million, nine hundred twenty-one thousand, nine hundred thirty-four".