20423477 has 4 divisors (see below), whose sum is σ = 21624876. Its totient is φ = 19222080.

The previous prime is 20423449. The next prime is 20423479. The reversal of 20423477 is 77432402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16072081 + 4351396 = 4009^2 + 2086^2 .

It is a cyclic number.

It is not a de Polignac number, because 20423477 - 2¹² = 20419381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600674 + ... + 600707.

It is an arithmetic number, because the mean of its divisors is an integer number (5406219).

Almost surely, 2^20423477 is an apocalyptic number.

It is an amenable number.

20423477 is a deficient number, since it is larger than the sum of its proper divisors (1201399).

20423477 is a wasteful number, since it uses less digits than its factorization.

20423477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201398.

The product of its (nonzero) digits is 9408, while the sum is 29.

The square root of 20423477 is about 4519.2341165290. The cubic root of 20423477 is about 273.3442191117.

Adding to 20423477 its reverse (77432402), we get a palindrome (97855879).

The spelling of 20423477 in words is "twenty million, four hundred twenty-three thousand, four hundred seventy-seven".