20769520 has 20 divisors (see below), whose sum is σ = 48289320. Its totient is φ = 8307776.

The previous prime is 20769517. The next prime is 20769521. The reversal of 20769520 is 2596702.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×20769520² = 862745922060800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20769521) 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, 129730 + ... + 129889.

It is an arithmetic number, because the mean of its divisors is an integer number (2414466).

Almost surely, 2^20769520 is an apocalyptic number.

20769520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20769520 is an abundant number, since it is smaller than the sum of its proper divisors (27519800).

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

20769520 is a wasteful number, since it uses less digits than its factorization.

20769520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259632 (or 259626 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 20769520 is about 4557.3588842662. The cubic root of 20769520 is about 274.8793740937.

The spelling of 20769520 in words is "twenty million, seven hundred sixty-nine thousand, five hundred twenty".