20438546 has 4 divisors (see below), whose sum is σ = 30657822. Its totient is φ = 10219272.

The previous prime is 20438521. The next prime is 20438567. The reversal of 20438546 is 64583402.

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

It can be written as a sum of positive squares in only one way, i.e., 17732521 + 2706025 = 4211^2 + 1645^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5109635 + ... + 5109638.

Almost surely, 2^20438546 is an apocalyptic number.

20438546 is a deficient number, since it is larger than the sum of its proper divisors (10219276).

20438546 is a wasteful number, since it uses less digits than its factorization.

20438546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10219275.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 20438546 is about 4520.9010163904. The cubic root of 20438546 is about 273.4114295318.

The spelling of 20438546 in words is "twenty million, four hundred thirty-eight thousand, five hundred forty-six".