20415480 has 64 divisors (see below), whose sum is σ = 62272800. Its totient is φ = 5352960.

The previous prime is 20415469. The next prime is 20415491. The reversal of 20415480 is 8451402.

It is an interprime number because it is at equal distance from previous prime (20415469) and next prime (20415491).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20415480.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5926 + ... + 8714.

Almost surely, 2^20415480 is an apocalyptic number.

20415480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20415480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31136400).

20415480 is an abundant number, since it is smaller than the sum of its proper divisors (41857320).

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

20415480 is a wasteful number, since it uses less digits than its factorization.

20415480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2864 (or 2860 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 20415480 is about 4518.3492560890. The cubic root of 20415480 is about 273.3085376410.

Adding to 20415480 its reverse (8451402), we get a palindrome (28866882).

The spelling of 20415480 in words is "twenty million, four hundred fifteen thousand, four hundred eighty".