20725784 has 8 divisors (see below), whose sum is σ = 38860860. Its totient is φ = 10362888.

The previous prime is 20725769. The next prime is 20725799. The reversal of 20725784 is 48752702.

It is an interprime number because it is at equal distance from previous prime (20725769) and next prime (20725799).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1295354 + ... + 1295369.

Almost surely, 2^20725784 is an apocalyptic number.

It is an amenable number.

20725784 is a deficient number, since it is larger than the sum of its proper divisors (18135076).

20725784 is a wasteful number, since it uses less digits than its factorization.

20725784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2590729 (or 2590725 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 20725784 is about 4552.5579622889. The cubic root of 20725784 is about 274.6862935148.

The spelling of 20725784 in words is "twenty million, seven hundred twenty-five thousand, seven hundred eighty-four".