20462645 has 30 divisors (see below), whose sum is σ = 30349422. Its totient is φ = 13206144.

The previous prime is 20462627. The next prime is 20462647. The reversal of 20462645 is 54626402.

It can be written as a sum of positive squares in 5 ways, for example, as 329476 + 20133169 = 574^2 + 4487^2 .

It is not a de Polignac number, because 20462645 - 2⁶ = 20462581 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 (20462647) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1203677 + ... + 1203693.

Almost surely, 2^20462645 is an apocalyptic number.

It is an amenable number.

20462645 is a deficient number, since it is larger than the sum of its proper divisors (9886777).

20462645 is an frugal number, since it uses more digits than its factorization.

20462645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 29 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 20462645 is about 4523.5655184821. The cubic root of 20462645 is about 273.5188467306.

Multiplying 20462645 by its product of nonzero digits (11520), we get a square (235729670400 = 485520²).

The spelling of 20462645 in words is "twenty million, four hundred sixty-two thousand, six hundred forty-five".