20515223155413 has 32 divisors (see below), whose sum is σ = 32915733760000. Its totient is φ = 11102910791616.

The previous prime is 20515223155387. The next prime is 20515223155423. The reversal of 20515223155413 is 31455132251502.

It is not a de Polignac number, because 20515223155413 - 2⁸ = 20515223155157 is a prime.

It is a super-2 number, since 2×20515223155413² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20515223155423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5673913 + ... + 8557086.

It is an arithmetic number, because the mean of its divisors is an integer number (1028616680000).

Almost surely, 2^{20515223155413} is an apocalyptic number.

It is an amenable number.

20515223155413 is a deficient number, since it is larger than the sum of its proper divisors (12400510604587).

20515223155413 is a wasteful number, since it uses less digits than its factorization.

20515223155413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14234641.

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 20515223155413 in words is "twenty trillion, five hundred fifteen billion, two hundred twenty-three million, one hundred fifty-five thousand, four hundred thirteen".