20151226620554 has 16 divisors (see below), whose sum is σ = 31817856288480. Its totient is φ = 9545278859280.

The previous prime is 20151226620533. The next prime is 20151226620557. The reversal of 20151226620554 is 45502662215102.

It is not an unprimeable number, because it can be changed into a prime (20151226620557) 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, 9739832 + ... + 11626124.

It is an arithmetic number, because the mean of its divisors is an integer number (1988616018030).

Almost surely, 2^{20151226620554} is an apocalyptic number.

20151226620554 is a deficient number, since it is larger than the sum of its proper divisors (11666629667926).

20151226620554 is a wasteful number, since it uses less digits than its factorization.

20151226620554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2167445.

The product of its (nonzero) digits is 288000, while the sum is 41.

Adding to 20151226620554 its reverse (45502662215102), we get a palindrome (65653888835656).

The spelling of 20151226620554 in words is "twenty trillion, one hundred fifty-one billion, two hundred twenty-six million, six hundred twenty thousand, five hundred fifty-four".