20540554 has 4 divisors (see below), whose sum is σ = 30810834. Its totient is φ = 10270276.

The previous prime is 20540543. The next prime is 20540557. The reversal of 20540554 is 45504502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45504502 = 2 ⋅22752251.

It can be written as a sum of positive squares in only one way, i.e., 20043529 + 497025 = 4477^2 + 705^2 .

It is not an unprimeable number, because it can be changed into a prime (20540557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5135137 + ... + 5135140.

Almost surely, 2^20540554 is an apocalyptic number.

20540554 is a deficient number, since it is larger than the sum of its proper divisors (10270280).

20540554 is a wasteful number, since it uses less digits than its factorization.

20540554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10270279.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 20540554 is about 4532.1687965035. The cubic root of 20540554 is about 273.8655368800.

The spelling of 20540554 in words is "twenty million, five hundred forty thousand, five hundred fifty-four".