20734560 has 432 divisors, whose sum is σ = 94112928. Its totient is φ = 4055040.

The previous prime is 20734559. The next prime is 20734573. The reversal of 20734560 is 6543702.

20734560 = T₄₂₇ + T₄₂₈ + ... + T₅₈₆.

It is a happy number.

20734560 is a `hidden beast` number, since 207 + 3 + 456 + 0 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1219672 + ... + 1219688.

It is an arithmetic number, because the mean of its divisors is an integer number (217854).

Almost surely, 2^20734560 is an apocalyptic number.

20734560 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 20734560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47056464).

20734560 is an abundant number, since it is smaller than the sum of its proper divisors (73378368).

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

20734560 is a wasteful number, since it uses less digits than its factorization.

20734560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 45 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20734560 is about 4553.5217140143. The cubic root of 20734560 is about 274.7250585420.

20734560 divided by its product of nonzero digits (5040) gives a palindrome (4114).

The spelling of 20734560 in words is "twenty million, seven hundred thirty-four thousand, five hundred sixty".