20161554 has 32 divisors (see below), whose sum is σ = 47675520. Its totient is φ = 5561472.

The previous prime is 20161553. The next prime is 20161567. The reversal of 20161554 is 45516102.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20161553) 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, 7059 + ... + 9494.

It is an arithmetic number, because the mean of its divisors is an integer number (1489860).

Almost surely, 2^20161554 is an apocalyptic number.

20161554 is an abundant number, since it is smaller than the sum of its proper divisors (27513966).

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

20161554 is a wasteful number, since it uses less digits than its factorization.

20161554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16594.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 20161554 is about 4490.1619124481. The cubic root of 20161554 is about 272.1706775531.

Adding to 20161554 its reverse (45516102), we get a palindrome (65677656).

It can be divided in two parts, 2016 and 1554, that added together give a triangular number (3570 = T₈₄).

The spelling of 20161554 in words is "twenty million, one hundred sixty-one thousand, five hundred fifty-four".