20197154 has 4 divisors (see below), whose sum is σ = 30295734. Its totient is φ = 10098576.

The previous prime is 20197141. The next prime is 20197159. The reversal of 20197154 is 45179102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45179102 = 2 ⋅22589551.

It can be written as a sum of positive squares in only one way, i.e., 14326225 + 5870929 = 3785^2 + 2423^2 .

It is not an unprimeable number, because it can be changed into a prime (20197159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5049287 + ... + 5049290.

Almost surely, 2^20197154 is an apocalyptic number.

20197154 is a deficient number, since it is larger than the sum of its proper divisors (10098580).

20197154 is a wasteful number, since it uses less digits than its factorization.

20197154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10098579.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 20197154 is about 4494.1243863516. The cubic root of 20197154 is about 272.3307772955.

The spelling of 20197154 in words is "twenty million, one hundred ninety-seven thousand, one hundred fifty-four".