20699745 has 16 divisors (see below), whose sum is σ = 36130752. Its totient is φ = 10036160.

The previous prime is 20699713. The next prime is 20699753. The reversal of 20699745 is 54799602.

It is not a de Polignac number, because 20699745 - 2⁵ = 20699713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20699697 and 20699706.

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, 62562 + ... + 62891.

It is an arithmetic number, because the mean of its divisors is an integer number (2258172).

Almost surely, 2^20699745 is an apocalyptic number.

It is an amenable number.

20699745 is a deficient number, since it is larger than the sum of its proper divisors (15431007).

20699745 is a wasteful number, since it uses less digits than its factorization.

20699745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125472.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 20699745 is about 4549.6972426745. The cubic root of 20699745 is about 274.5712105521.

The spelling of 20699745 in words is "twenty million, six hundred ninety-nine thousand, seven hundred forty-five".