20621154 has 16 divisors (see below), whose sum is σ = 41300640. Its totient is φ = 6864000.

The previous prime is 20621141. The next prime is 20621171. The reversal of 20621154 is 45112602.

It is a self number, because there is not a number n which added to its sum of digits gives 20621154.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3154 + ... + 7154.

It is an arithmetic number, because the mean of its divisors is an integer number (2581290).

Almost surely, 2^20621154 is an apocalyptic number.

20621154 is an abundant number, since it is smaller than the sum of its proper divisors (20679486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20621154 is a wasteful number, since it uses less digits than its factorization.

20621154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4865.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20621154 is about 4541.0520807408. The cubic root of 20621154 is about 274.2232804480.

Adding to 20621154 its reverse (45112602), we get a palindrome (65733756).

The spelling of 20621154 in words is "twenty million, six hundred twenty-one thousand, one hundred fifty-four".