420817545 has 64 divisors (see below), whose sum is σ = 784949760. Its totient is φ = 213497856.

The previous prime is 420817531. The next prime is 420817547. The reversal of 420817545 is 545718024.

It is not a de Polignac number, because 420817545 - 2⁵ = 420817513 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (420817547) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 971649 + ... + 972081.

It is an arithmetic number, because the mean of its divisors is an integer number (12264840).

Almost surely, 2^420817545 is an apocalyptic number.

420817545 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

420817545 is a deficient number, since it is larger than the sum of its proper divisors (364132215).

420817545 is a wasteful number, since it uses less digits than its factorization.

420817545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The square root of 420817545 is about 20513.8378905557. The cubic root of 420817545 is about 749.3728356994.

The spelling of 420817545 in words is "four hundred twenty million, eight hundred seventeen thousand, five hundred forty-five".