20356651523541 has 16 divisors (see below), whose sum is σ = 27217366394624. Its totient is φ = 13533522116544.

The previous prime is 20356651523531. The next prime is 20356651523561. The reversal of 20356651523541 is 14532515665302.

It is not a de Polignac number, because 20356651523541 - 2⁶ = 20356651523477 is a prime.

It is a super-2 number, since 2×20356651523541² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20356651523501) 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, 25141371 + ... + 25938423.

It is an arithmetic number, because the mean of its divisors is an integer number (1701085399664).

Almost surely, 2^{20356651523541} is an apocalyptic number.

It is an amenable number.

20356651523541 is a deficient number, since it is larger than the sum of its proper divisors (6860714871083).

20356651523541 is a wasteful number, since it uses less digits than its factorization.

20356651523541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820620.

The product of its (nonzero) digits is 3240000, while the sum is 48.

The spelling of 20356651523541 in words is "twenty trillion, three hundred fifty-six billion, six hundred fifty-one million, five hundred twenty-three thousand, five hundred forty-one".