20677470 has 32 divisors (see below), whose sum is σ = 54138240. Its totient is φ = 5012640.

The previous prime is 20677463. The next prime is 20677471. The reversal of 20677470 is 7477602.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20677471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31000 + ... + 31659.

It is an arithmetic number, because the mean of its divisors is an integer number (1691820).

Almost surely, 2^20677470 is an apocalyptic number.

20677470 is an abundant number, since it is smaller than the sum of its proper divisors (33460770).

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

20677470 is a wasteful number, since it uses less digits than its factorization.

20677470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62680.

The product of its (nonzero) digits is 16464, while the sum is 33.

The square root of 20677470 is about 4547.2486186704. The cubic root of 20677470 is about 274.4726864904.

The spelling of 20677470 in words is "twenty million, six hundred seventy-seven thousand, four hundred seventy".