20619680 has 24 divisors (see below), whose sum is σ = 48714372. Its totient is φ = 8247808.

The previous prime is 20619671. The next prime is 20619689. The reversal of 20619680 is 8691602.

It is an interprime number because it is at equal distance from previous prime (20619671) and next prime (20619689).

It can be written as a sum of positive squares in 2 ways, for example, as 20539024 + 80656 = 4532^2 + 284^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (20619689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64277 + ... + 64596.

Almost surely, 2^20619680 is an apocalyptic number.

20619680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20619680 is an abundant number, since it is smaller than the sum of its proper divisors (28094692).

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

20619680 is a wasteful number, since it uses less digits than its factorization.

20619680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128888 (or 128880 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 20619680 is about 4540.8897806487. The cubic root of 20619680 is about 274.2167464660.

The spelling of 20619680 in words is "twenty million, six hundred nineteen thousand, six hundred eighty".