20545602 has 48 divisors (see below), whose sum is σ = 52153632. Its totient is φ = 5335680.

The previous prime is 20545597. The next prime is 20545607. The reversal of 20545602 is 20654502.

It is an interprime number because it is at equal distance from previous prime (20545597) and next prime (20545607).

It is not an unprimeable number, because it can be changed into a prime (20545607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58 + ... + 6410.

It is an arithmetic number, because the mean of its divisors is an integer number (1086534).

Almost surely, 2^20545602 is an apocalyptic number.

20545602 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20545602, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26076816).

20545602 is an abundant number, since it is smaller than the sum of its proper divisors (31608030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20545602 is a wasteful number, since it uses less digits than its factorization.

20545602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6383 (or 6376 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20545602 is about 4532.7256700577. The cubic root of 20545602 is about 273.8879699003.

Subtracting 20545602 from its reverse (20654502), we obtain a square (108900 = 330²).

The spelling of 20545602 in words is "twenty million, five hundred forty-five thousand, six hundred two".